The original M16, (Colt Model Nos. 601 and 602) that were fielded in Vietnam with the Advisors in 1960/61 under Project ARPA, had no forward assist. The first modification with a forward assist and a partial mag fence was the early Model 603, the XM16E1 (denoting experimental changes to the M16) was released in 1964. It had forward assist, chrome bolt, and three prong flash hider. In 1967, they began to replace the XM16E1 with the M16A1. Ih had the new designed trapdoor stock and a birdcage flash hider.
This is my recreation. Colt M16 early furniture, a Colt forward assist (603) upper, PSA/H&R 20" pencil barrel and XM16E1 marked, partial fence lower. Rather than chrome (which is too expensive) I have a bright Nickel Boron BCG. I have a Juggernaught Hellfighter fixed mag kit so I can have my evil features. Magazine is a Colt Vietnam era 20 rounder permanently blocked to 10


















































Same weapon on different receiver showing NiB BCG
















This is my recreation. Colt M16 early furniture, a Colt forward assist (603) upper, PSA/H&R 20" pencil barrel and XM16E1 marked, partial fence lower. Rather than chrome (which is too expensive) I have a bright Nickel Boron BCG. I have a Juggernaught Hellfighter fixed mag kit so I can have my evil features. Magazine is a Colt Vietnam era 20 rounder permanently blocked to 10



Same weapon on different receiver showing NiB BCG



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