by Proof Research
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Proof Research Zermatt Origin Prefit Barrel for AR-15 chambered in 223 Remington. 26 inch stainless steel barrel with 1:7 twist, 4 Groove rifling, heavy competition profile. Prefit design for straightforward installation. Barrels are manufactured from 416R stainless steel and are double-stress relieved, drilled, contoured, and reamed to bore diameter, then cut rifled, lapped, and borescoped for precision.
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