M2WC Barrel Extension Browning Machine Gun Parts Search for: Search 5504082 Barrel Extension, Stripped, M2 .50 cal. $699.95 5504082-ASSY Barrel Extension, Complete, M2 .50 cal. $749.95 600978 Shank, Barrel Extension, M2HB. $49.95 B8925 Breech Lock, Early, M2HB. $49.95 7191302 Breech Lock, Late, M2HB. $49.95 6008784 Pin, Breech Lock, M2HB. $8.95 7266134 Spring, Lock, Barrel, M2HB. $16.95