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RE: May you live in interesting times...or in Pittsburgh!
Multiple uppers can be changed with just pulling one pin. The 300 blackout, and the 6.5mm Grendel even use the same magazines.
Cheap change...I am thinking about several upper changes myself.
:)>
sir smithlabs! dang you must have woken up from one of your naps, you're on it tonight! Well the barrel too.
Naugh, not awake, I can do this in my sleep, ROFLOL! But I think I will get a 300 Blackout upper, just to play with, here. The change is so hard, removing one pin....
:)>