Rob, I can't figure out the problem from that.Jams are usually from the feed arm working loose from the cam. Unscrew the top 8-32 from the feed arm and see if the bottom 8-32 is loose...If so, that's the problem.... and it happens a lot!Wyo
Floyd, I get three full mags (30 shots) with a pretty tight e.s. in each of my target guns... the ones with the scopes:They were all built the same with the valve mods, spring preload, etc.After the third mag is shot, I store them with whatever gas is remaining.When I shoot them again, I dry fire to empty before installing the new cart and it usually takes 2 to 5 shots to empty the gas.Rob, a couple more tear-down / build notes: - You don't have to remove the magazine follower but if you want to, there is a setscrew that retains the knob in the follower - Most broken pawls occur because people forget to remove them after the tube is slid about 1/2" rearward (the pawl will get jammed at the end of the tube slot) - In at least one variant, the valve retaining pins were different in size (o.d.) so they have to go back in their specific location (Crosman, Why would you do that?) - Make sure both valve vents are not blocked and do not use any kind of wet lube inside the hammer cavity - The cam / feed arm rotational positions (Up for Loading and Down for Firing) need to align perfectly with the center of the magazine and the center of the barrel accordinglyThat's not a complete list but a few things for now...Wyo
Thanks for this write up WYO.I was gifted a rather beat up 600 and thanks to your very thorough documentation I have it back in great working condition. Before and after pics.