A very scarce semi-automatic commercial version of the Swiss SIG Sturmgewehr 57, which utilizes a roller-delayed action design similar to the H&K G3 and Spanish CETME and was in service from 1957 to 1990, when it was phased out for the SIG SG 550. The semi-automatic PE versions were imported for a very short window of time in the early 1980s, making them a seldom seen rarity on the U.S. collectors market. Features folding hooded blade front and adjustable peep rear sights, barrel integrated grenade spigot launcher and ported muzzle brake, bayonet lug, folding bipod, folding carry handle, right side mounted "T" charging handle, color coded "S/1" selector markings, and flip-down winter trigger on the right side of the trigger housing. The top of the receiver is marked with "Swiss cross in shield" crest and the serial number, while the right side of the trigger housing is marked with a Mandall's importer mark. Matching partial "2539" serial numbers on the bolt, bolt carrier, trigger housing, stock assembly, and barrel shroud. Fitted with vented metal handguard with ribbed rubber grip section, ribbed polymer pistol grip, and straight rubberized buttstock. Includes bayonet and scabbard, leather saddle scabbard rig, leather sling, cleaning kit, spare spring set, two add-on iron sights, and black leather purse containing three extra magazines.