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Length: 16"
Material: 4140 Chrome Moly Steel
Contour: M4
Gas Port Size: .073"
Chamber: 5.56x45mm NATO
Twist Rate: 1 in 9"
Finish: Manganese Phosphate (Parkerized)
M4 Feed Ramps: Yes
Muzzle Thread Pattern: 1/2"-28
Gas Port Location: Carbine
Exterior Diameter at Gas Port: 0.750"
Made in the USA
This Matched Rise Armament Striker Gen 2 Lower and three caliber marked assembled upper receiver set is precision CNC machined from 7075-T6 aluminum and is Mil-spec component compatible. Included is a upper tension screw, bolt catch screw, and forward assist screw. The three assembled upper receivers are caliber marked as .223 WYLDE, 300 AAC BLACKOUT & 6.5mm GRENDEL. This model has a black hardcoat anodized finish.