Start by changing the inner most 020 oring on the back cap and change both orings on the tail of the bolt.
Recently got a pm7 and though it shot well I thought it was hard on air so I checked the bolt and noticed there was a lot of resistance. Changed alot of the orings there as well as both regs and it shoots much better even at 21 - 22 dwell.
MOWING FACES WITH A KARNIVOR PRO
Last edited by cmdrsuds : 08-14-2012 at 12:35 AM.