SIG SAUER SIG516 Rifle - Manual (Page 21)

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2.0. mechanical characteristics and Rifle theory
2.1 Rifle description
2.1.1 general
The Sig516 rifle is a gas operated short stroke pushrod rifle with a rotary bolt mechanism capable of semi-automatic
operation. Semi-automatic is defined as one round being fired each time the trigger is pressed to the rear until the
magazine is depleted of ammunition. The rifle is chambered in 5.56x45mm naTo and is compatible with .223 remington
ammunition.
2.1.2 barrel, Receiver and gas system
The barrel is mechanically mated to the receiver by means of a barrel nut, and the barrel extension. The flash suppressor
if applicable is screwed onto the muzzle end of the barrel via ½ x 28 TPi thread pattern. The gas block, which is fitted to
the barrel, contains the gas port and the gas valve which locates the pushrod to the upper receiver. The upper receiver
has an integral M1913 accessory rail for attachment of sights or optics.
FIG 1 Barrel wIth receIver and Gas system