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AR-15 · Lower receiver
Centurion Arms CM4 Forged Stripped Lower Receiver
$135
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
- Machined from 7075-T6 forgings
- Buyers report tight, wobble-free upper fit
- Flared magwell
Cons
- Mil-spec controls, no tension screw
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