Sig - Manhurin model CSA-MR

After the failure of the SIG 530 rifle (a gas operated, roller locked design), SIG looked for a much simpler rifle design, in both operation and manufacture. Wheat they came up with was fundamentally AK-like, with a two-lug rotating bolt in a very AK-like carrier and a long stroke gas piston. The upper and lower assemblies of the rifle were both made of sheet steel stampings. The whole design is very easily disassembled, economical to produce, and reliable in the field.

Bron: forgottenweapons