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AR-15 · Lower receiver
Seekins Precision SP223 Gen2 Billet Lower
$269
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. Ambi bolt release only.
Build with this partOpens the builder with this part fitted. Other parts change only if they have to.
Pros and cons
Pros
- Ambi bolt release pre-installed
- Upper tension screw and oversized trigger guard
- Enhanced magwell, dowel pins in place of roll pins
Cons
- Heavy for a lower at 10.9 oz
- Expensive next to forged lowers
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