Manual

2. WEAPON THEORY

2.1 Weapon description

2.1.1 General

The semiautomatic SIG SG 550/551 SP is a gas operated weapon with

rotary bolt mechanism. The operation and maintenance of the standard

version SIG SG 550 and the short version SIG SG 551 are identical.

SIG SG 550 SP

Standard version with folding butt, bipod and carrying sling

SIG assault rifle SG 551

Short version with folding butt.