LBC owns the patent for the original YM national match carrier. It is now sold under the LBC name. YM also builds a new design NM carrier. We normally stock them, currently out (they are popular), more due in 4-6 weeks.
We also stock the YM National Match Hardchrome carrier with lightening cuts. Same as the standard NM carrier, but with the weight reduced from 9.2 to 8.2 ounces. Drop-in, they reduce the reciprocating mass which minimizes carrier bounce. Also effective with adjustable gas systems to reduce recoil impulse for faster followup shots.