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AR-15 · Lower receiver
LMT Defense MARS-L Ambidextrous Stripped Lower Receiver
$392
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 release
- Duty-grade lower from an issued-rifle maker
- Integral trigger guard
Cons
- Expensive for a stripped lower
- Proprietary ambi parts are costly to replace
Other lower receiver options
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- 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