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AR-15 · Lower receiver
Radian Weapons AX556 Ambidextrous Lower Receiver
$450
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
- Ambi safety, mag release and bolt catch
- Self-adjusting SART upper tensioner
- Talon ambi safety selector included
Cons
- Heavy for a lower (about 1 lb)
- Proprietary parts harder to replace
- A-DAC bolt catch takes practice
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
- Aero Precision AR15 Gen 2 Stripped Lower Receiver $120