Originally Posted by timekeeper
If this is the halfblock jackal on PBN where someone's asking about the pump arm threading too short into the ram, then this is part of the issue. The halfblock is threaded too far onto the pump arm, ideally you want to have the marker cock about 1/8" before the bolt stops and have 1/16" showing in the breech, as nobody suggested.
I'd suggest you unscrew the block a turn or 2, that should make the bolt have the correct protrusion into the breech.
I'll try unscrewing the sled a little more, it's barely haging on. Worked on it for a while and figured it all out myself, but I'm going to have to work on that bolt. Grr