Marking under the handguard is "1B13BA OA-M4AH16C 5.56 NATO 1/7".
"MP" stamped near the 203 groove.
16", M4 profile, carbine gas system, appears to be Melonite treated, 0.068" gas port size (via caliper). Who makes this barrel?
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Member
Marking under the handguard is "1B13BA OA-M4AH16C 5.56 NATO 1/7".
"MP" stamped near the 203 groove.
16", M4 profile, carbine gas system, appears to be Melonite treated, 0.068" gas port size (via caliper). Who makes this barrel?
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