7184158$49.95Breech Lock. Dual Feed. US GI, NOS Condition.7188690$149.95M37 Dual Feed Barrel Extension, Stripped. US GI, NOS Condition.6147230-7.62$29.957.62mm Barrel Lock Spring, M1917, M1919, M37, IMI. New Condition.6131253$4.95Accelerator/Breech Lock Pin. US GI, NOS Condition.6147230$9.95.30 cal. Barrel Lock Spring. US GI, NOS Condition. M37 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 6131253 Pin, Accelerator/Breech Lock, M1919. $4.95 6147230 Spring, Barrel Lock, .30 cal., M1919. $9.95 7188690 Barrel Extension, Stripped, M37 $149.95 7184158 Breech Lock, M37. $49.95 6147230-7.62 Spring, Barrel Lock, 7.62mm, M1917, M1919, M37. $29.95