I might have asked you this before Mark, but how would the PWS piston kit work on a Stag N8CQB upper(10.3" barrel), and would a KAC RAS work on it(the Diablo is just a bit out of my price range at the moment)?
I also read on anther site about a Colt 6920 upper that had the piston kit installed, and the user was pretty happy with how it was working.
I'm thinking of sending you a couple uppers to be worked on......
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Talk to your Armorer Section head (Richard in Ottawa)... we arranged for him to test a PWS kit on one of the Colt/Diemaco guns. He should have test data from that installation and can give you feedback directly.
I would expect that the Stag would work well... quality product so I don't see any issues. The PWS site lists the various rails that will fit with their Piston Kit... we've also managed to modify some others that weren't listed but that's always an unknown until we try it.
Mark




















































