LEGO 42123 McLaren Senna GTR - Technic
An exciting mix of blue LEGO bricks for kids, bursting with ideas and inspiration. As kids build, play and build again, this timeless building toy unlocks creative potential and delivers developmental benefits that last a lifetime. Kickstart creative building with a LEGO brick starter set Children aged 4 and over will love playing with the 3 easytobuild LEGO toys. Simple instructions and fun features get the imaginative play started immediately. Theres a blue whale toy with big round eyes and a waterspout, a train toy with revolving wheels, and a mini robot toy with movable arms. The creative fun continues as kids mix the bricks to modify their models – then skyrockets as they produce endless imaginative creations of their own. Build valuable skills with LEGO bricks for kids LEGO Classic sets put openended play and selfexpression in kids hands. And as they build, create and imagine, they develop skills that support future happiness and success.
An exciting mix of blue LEGO bricks for kids, bursting with ideas and inspiration. As kids build, play and build again, this timeless building toy unlocks creative potential and delivers developmental benefits that last a lifetime. Kickstart creative building with a LEGO brick starter set Children aged 4 and over will love playing with the 3 easytobuild LEGO toys. Simple instructions and fun features get the imaginative play started immediately. Theres a blue whale toy with big round eyes and a waterspout, a train toy with revolving wheels, and a mini robot toy with movable arms. The creative fun continues as kids mix the bricks to modify their models – then skyrockets as they produce endless imaginative creations of their own. Build valuable skills with LEGO bricks for kids LEGO Classic sets put openended play and selfexpression in kids hands. And as they build, create and imagine, they develop skills that support future happiness and success.
An exciting mix of blue LEGO bricks for kids, bursting with ideas and inspiration. As kids build, play and build again, this timeless building toy unlocks creative potential and delivers developmental benefits that last a lifetime. Kickstart creative building with a LEGO brick starter set Children aged 4 and over will love playing with the 3 easytobuild LEGO toys. Simple instructions and fun features get the imaginative play started immediately. Theres a blue whale toy with big round eyes and a waterspout, a train toy with revolving wheels, and a mini robot toy with movable arms. The creative fun continues as kids mix the bricks to modify their models – then skyrockets as they produce endless imaginative creations of their own. Build valuable skills with LEGO bricks for kids LEGO Classic sets put openended play and selfexpression in kids hands. And as they build, create and imagine, they develop skills that support future happiness and success.
An exciting mix of blue LEGO bricks for kids, bursting with ideas and inspiration. As kids build, play and build again, this timeless building toy unlocks creative potential and delivers developmental benefits that last a lifetime. Kickstart creative building with a LEGO brick starter set Children aged 4 and over will love playing with the 3 easytobuild LEGO toys. Simple instructions and fun features get the imaginative play started immediately. Theres a blue whale toy with big round eyes and a waterspout, a train toy with revolving wheels, and a mini robot toy with movable arms. The creative fun continues as kids mix the bricks to modify their models – then skyrockets as they produce endless imaginative creations of their own. Build valuable skills with LEGO bricks for kids LEGO Classic sets put openended play and selfexpression in kids hands. And as they build, create and imagine, they develop skills that support future happiness and success.
in 24 offers
The lowest price for LEGO 42123 McLaren Senna GTR - Technic right now is $65.00 at Arons Collectables, compared across 12 retailers.
The all-time low was $8.29 on 9 Oct 2025 — today's price is 684% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 9 June 2026.
Last updated at 09/06/2026 17:38:02
LEGO Technic McLaren Senna GTR 42123 Lego Set
LEGO Technic McLaren Senna GTR 42123 Lego Set
TECHNIC - McLaren Senna GTR
Delivery $9.90
TECHNIC - McLaren Senna GTR
Delivery $9.90
LEGO Techinc McLaren Senna GTR (42123)
30-day returns
LEGO Techinc McLaren Senna GTR (42123)
30-day returns
LEGO Technic McLaren Senna GTR (42123)
Free next-day delivery
LEGO Technic McLaren Senna GTR (42123)
Free next-day delivery
LEGO Technic McLaren Senna GTR (42123)
Delivery between 15–23 June $7.80
LEGO Technic McLaren Senna GTR (42123)
Delivery between 15–23 June $7.80
originally posted on myer.com.au
Although I am a selective fan of Lego and over the years have bought for my children and now my grandchildren not everything they do fires me to purchase a set. This one was definitely for me to build & keep and at the moment display. I usually don't like Technic sets much, the Land Rover set was an engaging complicated build but over engineered and too big! This on the other hand is cleverly designed, engaging to build, I meandered along over several days and timed it as a total of 5 and a half hours, and looks great finished. For once I aced the stickers and they do add to the looks substantially. I am a model car fan and although the scale exceeds 1:18 it does not excessive clash with those I have on display and fits in one of those display cases - keeps dust ... MoreAlthough I am a selective fan of Lego and over the years have bought for my children and now my grandchildren not everything they do fires me to purchase a set. This one was definitely for me to build & keep and at the moment display. I usually don't like Technic sets much, the Land Rover set was an engaging complicated build but over engineered and too big! This on the other hand is cleverly designed, engaging to build, I meandered along over several days and timed it as a total of 5 and a half hours, and looks great finished. For once I aced the stickers and they do add to the looks substantially. I am a model car fan and although the scale exceeds 1:18 it does not excessive clash with those I have on display and fits in one of those display cases - keeps dust out. The moving exposed engine pistons, doors and steering (though the actual turning curcle is not to scale) make this a good display item. Other recent Technic sets I have enjoyed are also in the sub $100 category, the Rescue Hovercraft, the Digger and the Ducati motorbike. If you like cars you should enjoy this set and it's well priced.
originally posted on ebay.com
Not only is this a form of entertainment on piecing everything together, but it is educational as well. You have to follow the diagrams, which are a form of drawings, sort of speak, so this would hopefully, be beneficial in later years. Once everything is assembled, and each sticker is adorned, it does look good. It also gives you the sense of achievement, that you've completed something from scratch. There could be even more satisfaction if father and son/daughter get involved together, almost like team bonding.
originally posted on LEGO
I step away from legos when I finish Highschool, and growing up I was always intrigued by Lego Technic builds but never owned one. This was my first ever technic build & the nostalgic memories and excitement of building legos came right back, like it never left. The Senna is an excellent purchase especially for starters who have patience, some tricky parts but nothing that you can’t overcome. This build is worth every penny, I really enjoyed my time building it. I know I could’ve finish it in like a day or so, but I savored every moment, just put some music on an rock out. To make it even easier for it being my first technic build, I just did bag number by bag number instead of dumping everything out the bag. Also the most exciting part of this build is putting ... MoreI step away from legos when I finish Highschool, and growing up I was always intrigued by Lego Technic builds but never owned one. This was my first ever technic build & the nostalgic memories and excitement of building legos came right back, like it never left. The Senna is an excellent purchase especially for starters who have patience, some tricky parts but nothing that you can’t overcome. This build is worth every penny, I really enjoyed my time building it. I know I could’ve finish it in like a day or so, but I savored every moment, just put some music on an rock out. To make it even easier for it being my first technic build, I just did bag number by bag number instead of dumping everything out the bag. Also the most exciting part of this build is putting together the engine then connecting it to the chassis, then seeing the rear wheel drivetrain move the pistons(So Cool!). I will be purchasing the 911 as well,so I suggest that you do the same. Thank you Lego, the Senna is a must have!!.
| Features | |
| Remote control required | N |
| Material | Plastic |
| Country of origin | Hungary |
| Sound effects | N |
LEGO Technic McLaren Senna GTR 42123 Lego Set
LEGO Technic McLaren Senna GTR 42123 Lego Set
TECHNIC - McLaren Senna GTR
Delivery $9.90
TECHNIC - McLaren Senna GTR
Delivery $9.90
LEGO Techinc McLaren Senna GTR (42123)
30-day returns
Although I am a selective fan of Lego and over the years have bought for my children and now my grandchildren not everything they do fires me to purchase a set. This one was definitely for me to build & keep and at the moment display. I usually don't like Technic sets much, the Land Rover set was an engaging complicated build but over engineered and too big! This on the other hand is cleverly designed, engaging to build, I meandered along over several days and timed it as a total of 5 and a half hours, and looks great finished. For once I aced the stickers and they do add to the looks substantially. I am a model car fan and although the scale exceeds 1:18 it does not excessive clash with those I have on display and fits in one of those display cases - keeps dust ... MoreAlthough I am a selective fan of Lego and over the years have bought for my children and now my grandchildren not everything they do fires me to purchase a set. This one was definitely for me to build & keep and at the moment display. I usually don't like Technic sets much, the Land Rover set was an engaging complicated build but over engineered and too big! This on the other hand is cleverly designed, engaging to build, I meandered along over several days and timed it as a total of 5 and a half hours, and looks great finished. For once I aced the stickers and they do add to the looks substantially. I am a model car fan and although the scale exceeds 1:18 it does not excessive clash with those I have on display and fits in one of those display cases - keeps dust out. The moving exposed engine pistons, doors and steering (though the actual turning curcle is not to scale) make this a good display item. Other recent Technic sets I have enjoyed are also in the sub $100 category, the Rescue Hovercraft, the Digger and the Ducati motorbike. If you like cars you should enjoy this set and it's well priced.
Not only is this a form of entertainment on piecing everything together, but it is educational as well. You have to follow the diagrams, which are a form of drawings, sort of speak, so this would hopefully, be beneficial in later years. Once everything is assembled, and each sticker is adorned, it does look good. It also gives you the sense of achievement, that you've completed something from scratch. There could be even more satisfaction if father and son/daughter get involved together, almost like team bonding.
I step away from legos when I finish Highschool, and growing up I was always intrigued by Lego Technic builds but never owned one. This was my first ever technic build & the nostalgic memories and excitement of building legos came right back, like it never left. The Senna is an excellent purchase especially for starters who have patience, some tricky parts but nothing that you can’t overcome. This build is worth every penny, I really enjoyed my time building it. I know I could’ve finish it in like a day or so, but I savored every moment, just put some music on an rock out. To make it even easier for it being my first technic build, I just did bag number by bag number instead of dumping everything out the bag. Also the most exciting part of this build is putting ... MoreI step away from legos when I finish Highschool, and growing up I was always intrigued by Lego Technic builds but never owned one. This was my first ever technic build & the nostalgic memories and excitement of building legos came right back, like it never left. The Senna is an excellent purchase especially for starters who have patience, some tricky parts but nothing that you can’t overcome. This build is worth every penny, I really enjoyed my time building it. I know I could’ve finish it in like a day or so, but I savored every moment, just put some music on an rock out. To make it even easier for it being my first technic build, I just did bag number by bag number instead of dumping everything out the bag. Also the most exciting part of this build is putting together the engine then connecting it to the chassis, then seeing the rear wheel drivetrain move the pistons(So Cool!). I will be purchasing the 911 as well,so I suggest that you do the same. Thank you Lego, the Senna is a must have!!.
My boys are always talking about fast sports cars and debating which ones are the fastest or most expensive, so I hear about the McLaren a lot. This was the ideal Christmas gift for them because they were able to build and marvel over a version of it. They immediately opened the package and shorted pieces into zippered bags so they could take their time and work on it methodically. I did provide a little help with some of finding the right pieces but overall the instructions were clear and it was not too difficult. I think it’s a great brain exercise in attention to detail, following visual instructions, and completing tasks. It does have a ton of pieces so it is what I would consider a more advanced project than most they have done in the past but that did provide ... MoreMy boys are always talking about fast sports cars and debating which ones are the fastest or most expensive, so I hear about the McLaren a lot. This was the ideal Christmas gift for them because they were able to build and marvel over a version of it. They immediately opened the package and shorted pieces into zippered bags so they could take their time and work on it methodically. I did provide a little help with some of finding the right pieces but overall the instructions were clear and it was not too difficult. I think it’s a great brain exercise in attention to detail, following visual instructions, and completing tasks. It does have a ton of pieces so it is what I would consider a more advanced project than most they have done in the past but that did provide them with hours of occupation. I like that the instructions book is very large and breaks down each step into just a few pieces per page so it was easy to follow and flipping through you see how simple it is to get from start to finish. There are even realistic photos at the end that show it fully built and what the real thing looks like. This will look great on their display shelf and will also remind them of the fond memories of us working together on it. High quality just as you would expect from the brand.
My seven year old son has been very excited about this set. He's able to complete the Architect series with 95% independence. He probably would not have needed so much of my help if the pieces fit well together. Many of the tube connector pieces were too fat to fit into the holes! we had to clamp them so they would fit. it made it difficult for my son to complete the set on his own, and even adults could not fit the connectors into the holes without clamping the connector tubes. Maybe the pieces expanded? I'm not sure what was wrong but I've never had a problem with Legos.Finished product was beautiful and the price was definitely worth it!
My 12 yr old has just put this amazing LEGO Technic McLaren Senna GTR together. The finished product looks exactly like it shows on the box and in the website! It's larger than we expected which was a pleasant surprise! This car is just slick looking and very detailed. Perhaps the feature that sets it apart from other sets is the pistons that move up and down as the car drives! Also the wheels can turn aided with the use of a knob of top of the car. The instructions were clear and precise. There was minor confusion putting it together, as there were multiple bags labeled for each of the steps. But he was able to figure it out easily. Overall it took about one and a half to two hours to build. He was blown away with the finish product! Absolutely recommend this!
I got this for my eleven year old son who wanted to try out building model cars. He definitely needed some help. It took us hours to get through half. But the directions are clear and very informative. The car is large and looks amazing when complete. All the inside motor parts move with the car and I’m just extremely impressed with the overall outcome of the whole thing. It was definitely a little tiring and a lot of parts. I recommend only opening the parts for the section you are on because there are so many it can get confusing. My son is very excited and it now sits proudly on his shelf.
First off, I am so disappointed that Lego didn't go with this model for the 1:8 Scale Technic release. When I first saw the teaser images from Lego I was absolutely in love with this model and then when I found out it was roughly 1:16 I was disappointed. It is so beautiful that it would make a fabulous addition to the larger builds.There are a few pre-printed pieces in the set but a large portion of the decoration is by stickers. Yep, sticker heavy but well worth persevering with as they elevate the look immeasurably.The problem with the smaller Technic builds, for me, is that the engine block is simplified right down and that is my favourite bit of any Technic build. Have to say I had a complete blast building this car and enjoyed every single second of it (you ... MoreFirst off, I am so disappointed that Lego didn't go with this model for the 1:8 Scale Technic release. When I first saw the teaser images from Lego I was absolutely in love with this model and then when I found out it was roughly 1:16 I was disappointed. It is so beautiful that it would make a fabulous addition to the larger builds.There are a few pre-printed pieces in the set but a large portion of the decoration is by stickers. Yep, sticker heavy but well worth persevering with as they elevate the look immeasurably.The problem with the smaller Technic builds, for me, is that the engine block is simplified right down and that is my favourite bit of any Technic build. Have to say I had a complete blast building this car and enjoyed every single second of it (you couldn't wipe the grin off my face as it grew into a beautiful vehicle from chunks of plastic).Number Of Pieces: 830Approximate Price Per Piece: £0.05Build Time: 3.5 Hours
Our biggest little Lego fan usually prefers the movie or other themed sets, but most of all, he loves to build sets that spark excitement and challenge. The building sets that interest him the most, he completes in one day, usually the same day he gets it. I feel the same way about a good book as he does his favorite Legos, he doesn't want to stop and put it down! He built this TECHNIC set one evening with lots of excitement and enthusiasm.The LEGO Technic McLaren Senna GTR 42123 model building kit is packed with realistic details. This supercar toy model’s authentic features, like the detailed V8, had him running excitedly,to show us the moving pistons. Later, he was also enthusiastic about the dihedral doors that open ‘up and out' in the unmistakable style of ... MoreOur biggest little Lego fan usually prefers the movie or other themed sets, but most of all, he loves to build sets that spark excitement and challenge. The building sets that interest him the most, he completes in one day, usually the same day he gets it. I feel the same way about a good book as he does his favorite Legos, he doesn't want to stop and put it down! He built this TECHNIC set one evening with lots of excitement and enthusiasm.The LEGO Technic McLaren Senna GTR 42123 model building kit is packed with realistic details. This supercar toy model’s authentic features, like the detailed V8, had him running excitedly,to show us the moving pistons. Later, he was also enthusiastic about the dihedral doors that open ‘up and out' in the unmistakable style of the real McLaren. So many cool features like steering the McLaren toy car using the wheel on top. He did mention a few times that the build was hurting his fingers a bit, but said, "it's worth it"!This 830 piece set would be a great gift for any motorsport, supercar, or Lego building fan.We added a few more shelves above the Lego crafting table to display this completed remarkable car. The finished model measures over 3 in. (9 cm) high, 12 in. (32 cm) long and 4 in. (12 cm) wide.This collectible McLaren toy car features eye-catching graphics and colors. I recommend it for any Lego fans, aged 10 and up, who are ready for a new challenge in advanced building toys.
The car has good colors, there are some things I don't like tho. The lights seem to far back, and barely visible to the point where you would think, what's the point of even putting them there. This wasn't the most annoying part. Trying to connect the windshield at the front with those two plugs to the connects was obnoxious and frustrating. Last thing I would mention that as far as the rear. It looks a little chunky at the back and boxy. I personally would of been interested to see what it was like with out the back bottom arrow like fins on the back sides. Overall, it's still a good set. Just not really any features beside the turning and the pistons moving.
| Features | |
| Remote control required | N |
| Material | Plastic |
| Country of origin | Hungary |
| Sound effects | N |
