Here is the history of this weapon from the small arms book I like, "Military Small Arms of the 20th Century" by Ian Hogg and the late John Weeks. I wouldn't bother typing it, but it is really a pretty interesting story overall - read to the end for one of the more interesting bits.
"The PPS guns are, to some extent, an oddity in the Soviet armory since their policy during World War II was one of rigid concentration upon one model for each type of weapon. During the siege of Leningrad, however, the supply of guns ran very low, and the prototypes of the PPS42 were hurriedly manufactured in a local factory to a design best suited to the equipment available. Quite naturally it was simple in the extreme, but it proved surprisingly effective and continued to be made after the siege was raised; it was then improved to the PPS43 which differed only in the design of the folding stock, the form of the safety catch and in the barrel jacket (which, in the first model, had a vertical joint in front fo the magazine housing). In all, about one million of the PPS were made, and they continued in service for a few years after the end of the war.
Unusually for a Soviet gun, the PPS used a box magazine holding 35 rounds and it was never adapted to take the more popular drum. Despite its extreme simplicity bordering on crudity, the PPS was highly effective. It has now disappeared, having been rarely offered to other communist countries, though it was widely used by the Chinese forces Korea in 1951-52. The Finnish m/44 and m/44-46 series, and the Spanish/German DUX guns were derived from the PPS design. It is generally believed that the virtual suppression of the PPS in post-war years was due to a political decision by Stalin; the siege of Leningrad became something of a national legend of heroism and the leaders of that siege appeared to be gaining too much political influence in post-war years; they were all replaced, and the gun that reminded everyone of the siege was removed from public view."
PPS43
Round: 7.62mm Soviet Pistol
Length: butt extended 31.81in (808mm)
butt folded 23.85in (606mm)
Weight unloaded: 7lb 5oz
Barrel: 10in (254mm), 4 grooves, right-hand twist
Magazine: 35 round detachable box
Cyclic Rate: 700 rds/min
Muzzle velocity: c.1600 ft/sec (488 m/sec)
