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to original colt specs each part is gauge-checked during assembly for correct tolerances ... forgings tight tolerances match-grade barrels premium performance features complete ... sights without loss of zero match-grade barrels machined from extrahard 410 stainless ... drift during sustained fire stainless barrels are fluted to provide the rigidity of a ... barrel without the weight penalty all barrels have m4-style feed ramp to aid in ... installation of m203 grenade launcher shotgun or tear gas launcher yankee hill flip- ... alloy matte black finish chrome lined 16 40.6cm long 1-7 twist chambered for 5 ... plus the versatility to interchange barrels of varying length contour and twist ... all standard weight government profile barrels and most heavy contours up to .980 ... required with this upper fits most barrels up to .980 25mm o.d #741-000-005ee qcb ...