SIG SAUER P556 User Manual
Page 10
P556 Pistol Operators Manual
10
1511582 VER 08.01.08
2.0. Mechanical Characteristics & Weapon Theory
2.1. Weapon Description
2.1.1. General
The P556 Pistol is a semi-automatic, gas operated weapon with a
rotary bolt mechanism. Semi-automatic means one round will fire
each time the trigger is pulled until the magazine is emptied of
ammunition. The pistol is chambered in 5.56mm NATO and
is compatible with .223 Remington ammunition.
2.1.2. Barrel With Receiver And Gas System
The barrel is mechanically mated to the receiver. The flash
suppressor is screwed onto the muzzle end of the barrel which
features a Ω x 28 TPI thread pattern. The gas block, which is
fixed on the barrel, contains the gas port, locates the gas system
(gas tube and operating rod), accepts the front sight and also
serves as support for the hand guards. The receiver guides the
bolt and bolt carrier, and houses the locking system. An accessory
mounting rail is fixed to the upper part of the receiver, providing
an attachment point for sighting systems and other accessories.