This is a beautifully example of a professionally done fully legal short barreled rifle (SBR) converted by Vollmer Manufacturing from an original H&K 91 semi-automatic rifle into one of the desirable "HK51" short barreled rifles. Vollmer Manufacturing was a very well known and highly reputable Class II manufacturer, who in the 1970s and 1980s specializes in converting all types of firearms into both short barreled rifles and machine guns, specifically the HK series. They started with an original HK91 rifle with a "IB" date code receiver (1981), as the base weapon, the original "H&K 91" receiver markings were removed, and the receiver was faithfully remarked "HK51" directly in the same area, while retaining all the remaining original markings. During the conversion this rifle was upgraded with a military style G3 "paddle" lever magazine release and was fitted with an original "Clipped & Pinned", "S-E-F" metal trigger housing and an original HK sliding buttstock. During this conversion, the original barrel was shortened to the current 9 inch length and was refitted with a round ported flash hider that has five rows of three holes in each line. Then entire receiver/barrel group were refinished in a beautiful flat black finish that very closely matches the original HK factory finish. The rifle still retains its original post front sight and 100-400 meter military rear sight. As noted, it has an original H&K sliding paratrooper buttstock with a short black polymer plastic forend. This excellent rifle does not include any internal trigger pack, nor a magazine or additional accessories; however, both are easily available on the secondary market.

Very fine with 98% of its current all black painted finish with only very minor edge wear. The bolt head is still in the white and the breech face no evidence of being fired. Mechanically excellent. NOTE: This weapon is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 478.