GunBuildr
AI illustration of a similar part on the gun.
AR-15 · Lower receiver
Cross Machine Tool (CMT) UHP-15 Billet Stripped Lower Receiver
$209
Standard AR-15 lower for all five calibers. 7.62x39 steel mags can bind or fail to lock back in some magwells; an enhanced bolt catch or specific mag brand may be needed. .450 BM uses dedicated straight-wall mags that fit a standard magwell.
Build with this partOpens the builder with this part fitted. Other parts change only if they have to.
Pros and cons
Pros
- Billet 7075-T6 at 8 oz
- Nylon-tip tension screw stops wobble
- Threaded pins, flared textured magwell
Cons
- Not ambi; ambi version sold separately
- Pricey next to forged lowers
Other lower receiver options
- Aero Precision M4E1 Stripped Lower Receiver $155
- Geissele Automatics Super Duty Stripped Lower Receiver $175
- Spike's Tactical Spider Stripped Lower Receiver $107
- Centurion Arms CM4 Forged Stripped Lower Receiver $135
- Palmetto State Armory Sabre-15 Ambi Lower Receiver $100
- Griffin Armament Mk2 Ambidextrous Stripped Lower Receiver $220
- American Defense Manufacturing UIC Ambidextrous Stripped Lower Receiver $370
- Radian Weapons AX556 Ambidextrous Lower Receiver $450