I have several carbine length gas seystem AR uppers in 5.56 with A-2 sight towers

Tired of dented brass and 1 o'clock ejection I purchased a Ruber City Armory adjustable gas key and installed it on an M16 bolt

Simple instructions supplied with the key were simple/very easy to follow and after the 4th round the rifle ran the rest of the day without a single issue

Ejection is now 3 o'clock

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Maker of the Frankenstud Sling Keeper