Originally manufactured in Germany in 1985 as a HK94 semi-automatic rifle, this firearm was upgraded by Fleming Firearms of Collinsville, OK (so marked on the right side of the receiver, hidden by the trigger group) into a MP5 sub-machine gun, with a remarked receiver, proper length barrel, welded sear trip on the bolt and a "0/1/A" (safe/semi/full-auto) marked trigger group with a pack modified to be compatible with a commercial "shelf" style receiver. Patterned after the SD ("Schalldaemfer") variant, this example is fitted with a conventional, unported barrel, and currently lacks a silencer. With the closure of civilian machine gun registration in 1986, this H&K got in right under the wire, and would be among the last H&K guns to be fully transferrable. Fitted with a post front sight and a 4-peep rotating drum rear sight, Flemming added "MP5SD" marking and "IF" date code on top of the receiver and the Heckler & Koch Chantilly, Virginia address on the right side of the magazine well. The grip is right handed with the aforementioned markings on the trigger group, with a round, ribbed forearm and a fixed buttstock. With twelve extra magazines.