American Defense UIC Billet AR-15 Lower Receiver - Ambidextrous

2 Reviews

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The heart of the American Defense Universal Improved Carbine is now available for you to build your own. Machined from a solid 7075-T6 aluminum billet, the UIC billet lower is 40% stronger than a traditional Mil-Spec receiver while only weighing half an ounce more. To add to the toughness of this stripped lower receiver, American Defense applies a type III Teflon infused hardcoat anodized finish that protects against wear and corrosion for long term use. However, the fully integrated ambidextrous controls are what make this lower one of the most versatile. The UIC lower receiver features a truly ambidextrous bolt catch and magazine release pre-installed from the factory. But the ergonomics don't end there, the 20° flared magazine well aids in fast magazine changes and the enlarged trigger guard is ready for use with gloves. With chamfered edges and ambi controls, the ADM UIC billet lower receiver is the perfect start for your next build.

Trigger compatibility:
  • Not compatible with triggers that require external anti-rotation plates or screws
  • ADM offers a trigger pin kit for CMC Triggers
  • Fully compatible with standard GI triggers, Geissele triggers, and drop-in triggers with standard pins

  • Machined from 7075-T6 aluminum
  • Type III Teflon infused hardcoat anodized finish
  • 40% stronger than traditional MIL-SPEC receivers
  • Fully ambidextrous bolt catch and magazine release
  • 20° flared magwell
  • Includes ADM dimpled takedown pins
  • Receiver tension screw
  • Weight: 11 oz.

Also Included with the American Defense UIC lower receiver is the dimpled takedown pins that make disassembling your rifle easier. To eliminate any possible wobble between receivers, a tension screw is included. This screw is installed in the bottom of the lower near the grip screw and applies pressure on the upper receiver. American Defense have included every possible feature in this stripped lower receiver group, so you can build a highly capable AR-15.

American Defense Manufacturing LLC was founded with an idea and a lot of hard work. All ADM products are designed and built with U.S. sourced material in New Berlin, Wisconsin.
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BrandAmerican Defense
Caliber MarkingMulti-Caliber
FinishHardcoat Anodized
Receiver Material7075-T6 Aluminum
Trigger Pin DiameterMIL-SPEC .154
Weight11 Oz
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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The Best Ambi AR Lower on the Planet


This is the finest AR15 lower on the market today, bar none. I run this lower on all my AR builds. The ambidextrous setup is better than the LWRC ambi lower, even. Manufacture, fit and finish are flawless. The magwell has a nice flare that doesn't present itself on the outside profile. The left-side bolt catch is large and ergonomic. The ambi left side mag release is perfectly placed. Most significant, the right side lever serves to both release and catch the bolt carrier. Intuitive operation, for both right and left-hand operation. Right handers can lock the BCG to the rear without removing their firing hand from the pistol grip! If you are looking for a superior ambidextrous AR lower, look no further. The ADM UIC is by far the best.

I bought a Radian AX556 and an ADM UIC/MP4. Kept the ADM


The Radian is beautiful, and really nice to handle. No doubt, the machining is just a notch above ADM. But you know what?

The ADM works with Maxim's SCW pistol braces, while the A-DAC button prevents the support bars on the brace from fully retracting.

Also, having had some time to use the Radian, ADM and a POF (all of which have the bolt catch/release feature), the ADM is easily the most intuitive (up to catch, down to release) and natural (a sweeping motion up/down with my trigger finger) than press/hold and press like the AX556 or the quasi-uncomfortable button POF inserted into the trigger guard.

I like the simplicity, intuitiveness, and restraint of the ADM. Couldn't recommend it more highly.