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A .458 SOCOM complete upper is an assembly that drops onto any standard mil-spec AR-15 lower receiver to convert it to a heavy-hitting big-bore caliber. It features a dedicated .458 bolt carrier group (BCG), heavy barrel, and modified ejection port, allowing you to easily fire massive, hard-hitting projectiles. Key Specs & Features Caliber: .458 SOCOM. Compatibility: Drops onto standard AR-15 lower receivers (no modifications required). Barrel Length: 16" Twist Rate: Commonly 1:14 to stabilize heavy bullets Magazines: Feeds from standard AR-15 magazines, though capacity is roughly 10 rounds per 30-round mag. Muzzle Threads: Usually 5/8x24 for suppressors and brakes. I think I have about 40 rounds that will come with this.
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