M2 Barrel Extension. M2HB Barrel Extension, Complete with all parts. US, NOS Condition.

M2HB Early Style Breech Lock . US GI, Exc. Condition.

M2HB Late Style Breech Lock . New Condition.

M2 Bolt. M2HB Barrel Extension, Stripped. Barrel Extension parts are in stock. US, NOS Condition.

M2HB Breech Lock Pin. US GI, NOS. Condition.

M2HB Barrel Lock Spring. US GI, NOS Condition.

Replacement Shank for the M2HB Barrel Extension. US GI, Good Condition.