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Guntec USA AR .308 Builders Kit w/Ambidextrous Safety
$85.99 $73.99 Save 14%
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Most Helpful Negative Review Worst Kit Ever
I’m not sure if this was a mis labeled package but for the money I can’t even believe how bad multiple pieces were either wrong or did not fit well. Almost like they put AR 15 parts in instead of AR 10.
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Mixed Bag of Parts!

by JH, Verified Owner from MN, United States Written on January 5, 2025
Sadly, I took a chance, spun the wheel and lost big time.

Some parts fit my AR10 lower just fine - such as the takedown pins were correct. However, the Magazine Catch/ Release and the Safety Selector were sized for an AR15. Should have heeded the other warnings at face value. I'm returning this pack for a refund. First time I've been dissatisfied and disappointed with a purchase from Optics Planet. They've been stellar with exception of this single item. I recommend they pull this product from their website.
Pros:
  • None - it is not usable
Cons:
  • Mixed Parts - DOES NOT MATCH for an AR10 as stated on packaging
Best Used for:
  • Nothing. Not usable outside of adding to a bag of spare parts.
Would recommend: No
1 of 1 found the following review helpful.
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Aero M5 build do not recommend

by David, Verified Owner from NJ, United States Written on September 20, 2022
Safety selector won’t even fit in the receiver it’s very tight I would have to use a hammer to get it in, and even that might not work. You can tell it’s all low quality machining. The detents are poorly made also. 100% regret getting this, I only did because I’m having trouble finding kits in stock…. Wasn’t worth it. Spend a little extra time and money finding something better.
Pros:
  • Everything fits besides the safety
Cons:
  • Terrible machining
Best Used for:
  • Learning a lesson the hard way
Would recommend: No
1 of 1 found the following review helpful.
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Bad rear pin, worse safety

by Dustin, from CA, United States Written on September 22, 2020
rear take down pin wont even budge unless I use a punch. the safety is so hard to turn, with such small surface area of the trigger that is truly unpleasant to put the weapon on fire. definitely would not recommend. this product is very poorly done.
Would recommend: No
2 of 2 found the following review helpful.
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Poor quality and support

by m51, Verified Owner from WA, United States Written on August 23, 2019
Fit and finish is sub par. Biggest problem was no info on torx tool needed to install bolt catch screw. Called Guntech support and was told a T8. WRONG!!!! After another call, they said T6. Now another trip to the store (I'll buy a full set this time as I only have T8 and higher) and hope this works. Very poor kit and service.
Pros:
  • None
Cons:
  • No instructions
  • Poor fit and finish
  • Poor customer support
Best Used for:
  • paper weight
Would recommend: No
1 of 2 found the following review helpful.
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Take down pin did not work

by Ao, from CO, United States Written on August 9, 2019
Everything in the kit worked except for the rear take down pin. The groove for the detent was not milled 100% and would not allow for the pin to clear the lower reciever making room for the upper to be installed. Had to order another take down pin separately.
Pros:
  • Decent price same quality as the cheaper kit
Cons:
  • Takedown pin didnt work
Would recommend: No
2 of 2 found the following review helpful.
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