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to provide a fast, secure, and enjoyable experience. by MS, from OK, United States Asked on June 11, 2018
MPN: 55DC747 is a medium taper profile barrel with a mid-length gas system, MPN: 55DDF7C is a multi role profile barrel with a carbine gas system, and MPN: 55D21E1 is a government profile barrel with a rifle length gas system.
