Manufactured in Broken Arrow, Oklahoma, this individually marked and registered auto sear is installed in a matching numbered shelf pattern trigger pack, which in turn is installed in item B of this lot.

Manufactured in 1981 in Germany and imported by HK Inc as a semi-automatic rifle, this "HK 51" marked rifle was upgraded by Vollmer to act as the host gun for the sear described in Item A. Hooded post front and four-position drum rear sights, with a Fabian Brothers ported flash hider on the threaded muzzle, triangular handguard, textured pistol grip and two-position telescoping buttstock. The model, caliber and importer markings are present on the magazine well, with the sear number added to the right side of the mag well and Vollmer's address on the right side of the frame beneath the trigger housing. The receiver is in the "shelf" pattern, with a matching trigger housing featuring a right-handed selector switch and "0/1/A" position markings. The bolt carrier is a former semi-auto unit with a welded up sear trip, with both the carrier and the bolt head dated "IB" (1981).