Mega Arms Billet GTR-3H Ambidextrous AR-15 Receiver Set

Manufactured by Mega Arms
Manufactured by Mega Arms
2 Reviews
$359.99 $506.66

In Stock

Standard orders will ship out in 1 business days or less if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to



The Mega Arms GTR-3H Billet Ambidextrous AR-15 Receiver Set is what you need for your next premium AR-15 build. The upper and lower are fully machined from a billet of 7075-T6 aluminum and hardcoat anodized black to better than military specifications for longer term corrosion resistance. The stripped lower receiver features an integral trigger guard and a built-in ambidextrous bolt release. The magazine well features a flare for faster magazine changes and the front is textured for a better magwell grip.

  • 7075-T6 aluminum billet
  • Matched receiver set
  • Hardcoat anodized matte black
  • Ambidextrous bolt release
  • Integral trigger guard
  • Flared magwell
  • Mil-Spec parts compatible
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BrandMega Arms
Caliber MarkingMulti-Caliber
FinishHardcoat Anodized
Receiver Material7075-T6 Aluminum
Trigger Pin DiameterMIL-SPEC .154
Feed RampsM4
Forward AssistAccepts Standard Forward Assist
Port DoorAccepts Standard Port Cover
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

2 reviews

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Mega arms - good shit


Prob the best upper/lower billet set you can get. Hard to find since they were bought by zev ?? Not sure exactly what happened but hard to find mega products now without the zev emblem and price mark up. I will be buying more of these

Best Receiver Set on the Market


This is hands down the best receiver set on the market. The fit from upper to lower is great. There is absolutely no wobble, yet the take down pins can still be easily pushed and pulled. I have the mega forged receiver set as well and it is also top notch. I doubt I will ever buy receivers from any other manufacturer again. I do wish they did bring back their pre ZEV matte finish though.