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in the M4 type AR barrel?
My military experience with the M16 dates back to the M16A1 so the M4 and it's accessories are new to me. Looking at the vast assortment of AR barrels I see this OD groove 4 or 5 inches back from the muzzle on barrels that are M4 type. Can someone enlighten me on what the purpose of this groove is?
My military experience with the M16 dates back to the M16A1 so the M4 and it's accessories are new to me. Looking at the vast assortment of AR barrels I see this OD groove 4 or 5 inches back from the muzzle on barrels that are M4 type. Can someone enlighten me on what the purpose of this groove is?