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PSA B5 Systems EPT Lower Build Kit with SOPMOD Enhanced Stock, FDE. This kit provides the essential components to finish a lower receiver with a stock. It includes the Mil-Spec SOPMOD Enhanced Stock and Type 23 P-Grip from B5 Systems, a Mil-Spec buffer tube assembly, and a PSA Classic Lower Parts Kit. The SOPMOD stock design features ambidextrous sling mounts and mil-spec construction. The kit is intended to finish a lower receiver for AR-15 platforms and is compatible with standard Mil-Spec lower builds.
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A comprehensive overview of every major component in an AR-15 build—including what's inside bolt carrier groups and parts kits—organized by assembly for new builders.
12 min read
Guide
A neutral guide to component strategies for left-handed shooters, left-eye dominant right-handed shooters, and those managing eye/hand dominance mismatches. Covers ambi uppers, charging handles, gas system tuning, and real-world tradeoffs.
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