
Originally Posted by
RAM Engineer
Actually, the carbine length gas system was designed for the CAR-15 SMG/"Survival Rifle"/"Commando"/XM177/XM177E1/XM177E2 which all had 10"-11.5" barrels.
The earliest prototype "carbine" model ARs had 16" barrels with what appear to be approximate mid/intermediate length gas systems (fig. 166, "The Black Rifle", Stevens & Ezell).
The first OFFICIAL carbine, model 605 (fig. 168, ibid), had a 15" barrel with a rifle length gas system. However, "only a handful" were ever produced.
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