Sten, MK II, 9mm, Sub Machine Gun

The Sten (or Sten gun) was a family of British 9 mm submachine guns used extensively by British and Commonwealth forces throughout World War II and the Korean War. They were notable for having a simple design and very low production cost.
STEN is an acronym, cited as derived from the names of the weapon's chief designers, Major Reginald Shepherd and Harold Turpin, and EN for Enfield. Over 4 million Stens in various versions were made in the 1940s.
The official designation "Carbine, Machine, Sten" should not be confused with the common understanding of carbine; the Sten was a typical, almost stereotypical submachine gun while the term carbine is used to refer to short, light rifles. The "Carbine, Machine" element of the designation resulted from the British term for a submachine gun - "Machine Carbine" - in the early part of the Second World War.

C&R MG42 German Machine Gun

MFG CRA in 7.62mm x 51 and 8mm kit 21-3/4" barrel with a very good bright bore.
Referred to by the Allied forces as "Hitler's Zipper" or "Hitler's Buzz Saw", capable of firing 1200 rounds per minute. The MG-42 replaced the MG-34, being easier and quicker to manufacture.
Built largely from stampings and with quick barrel change to accommodate rapid rate of fire. Designed by Mauserwerke in collaboration with Grossfuss of Dobeln. The recoiling parts were lightened by the designer to allow for more rapid rate of fire.
The guns method of operation is often described as short recoil, gas assisted and roller locked which became the standard design feature in HK MG. The top cover mechanism was later copied in the US M60 MG.