The MBC kit includes four bolt catch buttons — Standard, Oversized, Left Extended and Right Extended — that can be easily changed with the bolt catch base still installed. Made from lightweight polymer, the buttons are textured and vary in size for enhanced ergonomics. Also included in the MBC kit is a heat-treated steel bolt catch base, bolt catch roll pin and spring and hex key. MSRP is $34.95.

Similarly, the MMR kit includes three magazine release buttons — Standard, Extended and Oversized — plus a steel magazine catch with spring, SUS630 stainless steel shaft sleeve and mag button adapter. The magazine release buttons feature texturing for positive feel and can be changed by pushing the installed button off with a screwdriver or punch. MSRP is $35.95.

For more info:, Ph: (714) 557-9831