Figure Checking head space

touches bottom to prevent damaging tap or cylinder. Remove tap and thoroughly clean chamber. b. Carbon and Rust.

(1) Carbon. Because of the rearward position of the gas port and high gas pressure encountered there, excessive carbonization of cylinder and piston is unlikely. However, these parts should be cleaned at regular intervals, or when fouling or sticking of piston is evident; the gas port in the barrel should be inspected and cleaned if necessary. Remove piston nut and piston from gas cylinder and scrape excess carbon off with flat blade. Take care not to scratch parts unnecessarily. When car-

M14 Barrel Removal Headspace

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