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西格-绍尔武器公司SIG556xi步枪采用模块化设计,除一体式上机匣/上护手组件不变外,下机匣、弹匣、枪机、枪管、下护手、枪托均有不同的类型。该枪有7.62×39mm、5.56×45mm及0.300英寸BLK 3种口径,由于5.56×45mm枪弹与0.300英寸BLK枪弹除弹径不同外,其余外形尺寸相同,因此这两种口径型均使用AR系下机匣、枪机、弹匣;而7.62×39mm口径型只能使用AK系枪机,下机匣则既可使用AR系的,也可使用AK系的,使用前者时,只能配用STANAG7.62×39mm弹匣,使用后者时,只能配用AK系弹匣。每种口径型号的枪管
Sig-Sauer Weapon Company SIG556xi rifles with a modular design, in addition to the unity of the casing / hand guard components unchanged, under the receiver, magazine, bolt, barrel, lower hand, stock Different types. The gun has 7.62 × 39mm, 5.56 × 45mm and 0.300 inch BLK three kinds of caliber, since the 5.56 × 45mm bullets and 0.300 inch BLK bullets in addition to the different diameter, the other dimensions are the same, so these two caliber are used AR system Receiver, shotgun, magazine; and 7.62 × 39mm caliber can only use the AK-based bolt machine, the next receiver can use the AR system can also use the AK system, the former can only be used with STANAG7 .62 × 39mm magazine, use the latter, only with AK series magazine. Barrel for each caliber model