Quote Originally Posted by TonyL View Post
At 12.1, I'd be taking that extra coil off, Pete. The issue, to my mind, can often be down to the transfer port choking and not flowing the air quickly enough with the more rapid compression and pressure & temperature build-up. If an extra coil off dropped the power too much (I guess it won't), you can always put an extra washer or two in.
I'm going to Tone, I like my rifles at around 11ish, I'd like to put the slip washer back on the rear guide.