Description The BoreBuddy mag springs provide the required upward force to activate the last round bolt hold open and improve feeding and mag reliability. 10/15rd springs fit: Kriss short body (10/15rd), old Style CMMG (25 and 10 round), Black Dog (all types), 30 round Ceiner/Numerich .22, and many 3d printed AR22 mag designs. 25rd springs fit: Kriss long body (25rd or 10/25rd), Black Dog 32 Round, and many 3d printed AR22 mag designs.
