SIG SAUER SIGM400 Rifle - Manual (Page 58)

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7.3. Hand Guard Removal
CAUTION: DO NOT REMOVE THE HAND GUARD ASSEMBLY UNLESS THE UPPER AND LOWER RECEIVERS ARE SEPARATED.
REMOVAL OF THE HAND GUARD WILL EXPOSE THE GAS TUBE ASSEMBLY. SHOULD THE RIFLE FALL OR STRIKE A HARD
SURFACE, THE GAS TUBE COULD BE DAMAGED EFFECTING OPERATION OF THE RIFLE. SEPARATING THE RECEIVERS
REDUCES THE OVERALL WEIGHT OF THE RIFLE REDUCING THE RISK OF DAMAGE SHOULD THE RIFLE FALL OR STRIKE A
HARD OBJECT OR SURFACE.
FIG 31 EXPLODED VIEW OF HAND GUARD
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