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So could the p320…I am not a big fan of SIG either.. however, It does show it can be done.
The video did mention the taper of the bolt lugs which l'm assuming would require a proprietary extension. But going off of what they did with the Spear LT line (it's not a normal AR barrel extension, at least on the 300BO models) I can't see the HYP bolt and extension as being anything BUT proprietary dimensionally. I mean it is Sig. Leave it to them to make a "pattern" DI rifle proprietary.I wonder if their bolts and barrel extensions are dimensionally proprietary as to reject mixing of bolts not rated for that pressure/bolt thrust.