Sig Sauer SG557

Sig Sauer SG557

GiterDunn
A hypothetical version of what the 556xi should be if they would forget about that caliber change BS and focused on weight savings and usable features. Carbine length gas system, barrel/gas tube are free floated by separating the rail system from the gas block and allowing it to bear against the barrel trunnion, gas block lightened by loosing the bayonet lug and handguard retainer portion, 14.5" barrel, angled cocking lever to clear scope mounts, bolt guide rail unit is simplified to be bent from plate instead of machined, lower receiver lightened by milling off the lower mag well while leaving a mag guide rib in the trigger guard like a tommy gun, milling flat the sides of the trigger guard, and drilling a large hole straight up through that area towards the bolt hold open. This hole then houses an XM8 style paddle mag release, which acts on a standard AR style release via a cam, like an MP5. Oh and an MLOK lower rail section. #Sig #Sig556 #SigSauer #SG550 #SG551 #SG552 #SG553 #SG556
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