731211$699.95M3 Barrel Extension, Stripped. US GI, Excellent Condition.600978$49.95Replacement Shank for the M2HB Barrel Extension. US GI, Good Condition.6008784$8.95M2HB Breech Lock Pin. US GI, NOS. Condition.6008908$19.95M3 Barrel Lock Spring. US GI, NOS Condition.7191302$79.95M2HB Late Style Breech Lock . US GI, Exc. Condition. M3 Barrel Extension Browning Machine Gun Parts Search for: Search Showing all 5 results Default sorting Sort by popularity Sort by latest Sort by price: low to high Sort by price: high to low Sort by name: A to Z 600978 Shank, Barrel Extension, M2HB. $49.95 7191302 Breech Lock, Late, M2HB. $79.95 6008784 Pin, Breech Lock, M2HB. $8.95 731211 Barrel Extension, M3. $699.95 6008908 Spring, Lock, Barrel, M3. $19.95