Originally Posted by TheSadPanda
Does anybody know how much of the Sig 516 bolt carrier group is proprietary and how much is standard? Trying to make so e decisions for potential back up stuff.
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the BCG itself does not interchange with DI guns ( tho I suspect it might interchange with a LWRC BCG despite the different look)
bolt, (and everything thats in it) plus the firing pin, the firing pin retaining pin and the cam pin all interchange with DI guns.
So all wear items except the piston system spring and one roll pin in the gas system interchange with DI guns. Those 2 are wear items but it is not clear how soon they wear out.
The roll pin can easily be replaced with a same form a hardware store according to those who have done it (I have not)
The primary wear item left that is propriatory is the piston spring IMO...
Have not yet contacted SIG if they will sell the part