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Description: This BCA AR-10 complete .243 rifle length upper has a 20" parkerized heavy barrel and features a 1:8 twist rate, with a rifle length gas system. It includes the new 15" MLOK Split Rail, an M4 flat-top billet upper receiver, a BCA AR10 bolt carrier group, a flash hider, and a rear charging handle. This .243 is compatible with 1st gen DPMS low profile lowers. This Sporter Slick Side upper has no forward assist or dust cover.
Note: We strive to provide the most accurate photographs of our product. Variations may occur in the skeletonized section of the handguard/flash hider you receive.
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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.
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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.
6 min read