Later M16 models and the M16A1 had an improved rifling with six grooves, right-hand twist, one turn in 12 inches (1:304.8 mm or 54.8 calibers) for increased accuracy and was optimized to adequately stabilize the M193 ball and M196 tracer bullets.

Black - Proper for Model 602, XM16E1, M16A1 & later generation rifles introduced after 1963; Green - Proper for early Model 601 rifles, the first AR-15 adopted by the US Air Force in 1959; Brown - Similar to the earliest AR-15 Prototype rifle furniture used in the late 1950s

BKF M16A1 Colt Commando (XM177/GAU-5) Style Complete Upper Includes: BKF M16A1 Forward Assist, No Brass Deflector Assembled Upper Receiver BKF AR15 11.5″ – 1-7 Twist CLP Barrel (Note: Pinned over 16″ for use on standard Lower)

Nov 29, 2011 · The M16A1 I was issued in basic training at Ft. Jackson, SC was stamped GM Hydramatic Division on the lower receiver (left side of the mag. well) and was greenish in color (the metal parts) vs. the darker gray/black parkerizing on some of the other M16's.

Colt 604 / M16A1 Upper Receiver with Teardrop Forward Assist, Complete, Loose Dust Cover *Fair*

The M16A1 is a variant of the original M16 rifle, which was designed in the 1960s. This GoatGun model is colored OD Green after it gained prominence as the standard-issue rifle for U.S. troops during the Vietnam War.

M16A1 Barrel is perfect for your next Colt kit build and made by Green Mountain Barrel . These have a chrome lined interior and a phosphate finish. Important Information. It is your responsibility to be familiar with your current local gun laws BEFORE placing your order.

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Jul 23, 2016 · collecting all things akm-63, polish and russian akm / akms, svd, tantal, vz58, anything 5.45 / ak74 and now classic m16a1 thru m4a1. current hobbies are sorting and cleaning neat and rare parts.

New US Green Mountain Chrome lined barrel,Not Colt; Threaded 1/2x28; 1:9" Barrel Twist; 20 Round mag, Not Colt; Sling; Rifle case; Made by Southern Tactical; These M16A1 Retro style rifles are built using a base of Colt M16A1 parts kits and a new US barrel, lower receiver and new semi fire control.