BUSHMASTER® M4A3 PATROLMANS CARBINE UPPER ASSEMBLY•Similar to the M4-type carbine but w/additional barrel length •4150 chrome moly-vanadium steel barrels features hard chrome lining in bore & chamber •Forged, lightweight 7075-T6 aircraft-quality aluminum & M16A2-designed receiver includes integral brass deflector, bolt catch assembly & raised ribs •Hard anodized finish •Factory headspaced, test-fired & ready-to-use Cal. Brl. 5.56 NATO/.223 Rem. 16″
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