20" AR-15 / XM16E1 / M16 / M16A1 Rifle Barrel Assembly (.625)

$259.00 - $299.00
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This "Pencil" profile barrel assembly is the same size/shape/weight as the original AR-15, XM16E1,  M16 and M16A1 models. Basically all light weight 20" inch barrel models from 1961-1983.

Available in all three Twist Rates this Barrel has been used by the USA and Canadian Military.

Multiple Muzzle Device choices, correct for the twist rate used at the time.

Includes triangular handguard cap ready to accept old style triangular handguards (Oval available on special request).



Twist Rate Choice: 1:7 .. 1:12 .. 1:14

1:7 is Nitride finished

1:12 & 1:14 are Chrome lined and Phosphate finished

Choice of muzzle device (Duck Bill, 3 Prong or A1)

.625 FSB - non-F mark, tapper pinned ("F" marked available on request)

M16A1 Round Front Sight Post and assembly (A2 available on request)

Early Flat Style Straight "Slip Ring" (Later Delta Ring available on request)

Gas Tube & Roll Pin included

Barrel Shim (just in case it is needed for Barrel Nut timing, taper pins do not need to be removed to install)

2 lbs. 4 oz.


Notes on Options:


Twist rate mostly affects what types of bullets you can use and your level of Purism:

- 1:14 is what ArmaLite started with in the late 50's .. for prototype models and the first Model 601 (1959-1963). Can only use 55gr or shorter length bullets.

- 1:12 is best suited to 55gr and some 62gr.. used on all Colt models 1963-1983

- 1:7 can shoot anything you can buy, including 77gr heavies (mk262), 75gr TAP and Tracers (1983 - current). Finish is Nitride, which is significantly more rugged/durable than the original Phosphate finish.


Bayonet Lug:

Due to the laws in some Municipalities, we do offer this assembly with a "Shaved" Bayonet lug. Unlike our full removal on our Shorty Carbines, for this assembly we will shave just the wings of the lug (rendering it useless for use).. but leave the center post to retain as much of the original appearance as possible.



* Note, Deliver can run 4 to 10 weeks