12-21-2016, 12:50 AM
Just check the boltface depth-.136- then run it. I have 3 Grrr uppers here, only 2 bolts. All are fully interchangeable. Never an issue. I push hard on them once in a while- boringville.
BTW, I'm selling 1 upper. Pm me if ?
dave, just get the best price you can. Check Ebay,,,,
BTW, I'm selling 1 upper. Pm me if ?
dave, just get the best price you can. Check Ebay,,,,