SIG SAUER P556 - Manual (Page 18)

P556 Pistol Operators Manual
18
1511582 VER 08.01.08
2.1.10. Magazine
The pistol ships standard with (1) 30-round magazine. The P556
is compatible with M16/AR-15 type magazines.
2.2. Technical Specifications
Caliber 5.56mm NATO (.223 Remington)
Total length 21.5 inches
Barrel length 10 inches
Number of grooves 6
Rifling 1 in 7
Weight (w/out mag) 6.3 lbs (Quad Rail add 0.4 lbs)
Specifications are approximate and subject to change without notice.