Alrighty, I believe I've got everything squared away with the Hatsan 95. This Red 'N' Tacky looks to be excellent stuff!Trying to get the piston back in with the Custom Air Seals piston seal though, and this thing is tight in the piston chamber. It appears to be oversized by a decent margin.I'd either need to grease the seal's surface or...sand it down, perhaps? From what I've seen, getting moly paste on the front of the seal is a no-no.
It's strange it's so tight. You should be able to push the piston in without a hammer. Be careful the edges of the lip don't catch and get cut and nicked by the cutouts in the compression tube, Don't lube the chamber; lube the seal and piston skirt, but be careful not to get any lube in front of the seal lip.
My thoughts from this, piston seal will be a tight fit until at lest 1/4" or so past the stampings / cutouts, then the precision is of matter, so careful guiding past these parts are important. Then decide o=n the amount of forward resistance is needed, per style of piston cup design.
Quote from: Back_Roads on November 13, 2022, 03:11:05 PM My thoughts from this, piston seal will be a tight fit until at lest 1/4" or so past the stampings / cutouts, then the precision is of matter, so careful guiding past these parts are important. Then decide o=n the amount of forward resistance is needed, per style of piston cup design.Oh, I've got it past the stampings and cutouts now--stuck! I sized it down to 27mm, gave a few thwacks to see if that'd get it moving, but it only managed to get the piston completely stuck in the piston chamber. I've got it baking in the oven now. Assuming I can yank the thing out, I'll try sizing it down another 0.1mm.
...or go in and take a bit more off the seal, measure twice cut once
And the results are in!I applied a thin coat of moly to the piston chamber and used a touch more than a .177 BB sized amount. No dieseling, so that's a bonus. Sanded the piston seal down just a tiny bit more and didn't bother measuring it, but if I had to guess, it's 26.9 or 26.95mm to the piston chamber's 27mm diameter. All in all, it took maybe 5lbs of force to get it seated all the way in. Once reassembled, the first few shots were a noticeable improvement in feel. No more awful twang or vibration, just a solid thwump. It's no longer a PITA shooting it. I tried a few groups with CPHPs, Barracuda 18s and 21s, H&N FTTs, Norma FTs, and H&N Excite Hammers (it shot the Hammers better than anything previously). This time around, Barracuda 18 and 21s did best out to 30 yards, 3/4". CPHPs looked promising at 10, but scattered at 20. H&N FTTs appeared to group at 20 for the first few shots. I stuck a new target up to get a group on them, and they were all over the place. Figures.Thinking the lighter pellets were destabilizing, perhaps from flying too quick, I set up the chrony. It appears the opposite was probably true. I'm seeing very steady, non-erratic speeds on CPHPs and H&N FTTs of around 705 FPS, with an extreme spread of 10FPS. That's a good deal slower than advertised, and I know I've seen 800s on the gas pistons--correct me if I'm wrong, but the gas setups aren't quite as strong. Unless the spring is shot, and it shouldn't be, my guess is the piston seal is still too tight in the chamber. Thoughts? Should I run a few hundred pellets through it and see if it improves?
Possible trigger linkage rubbing on the stock
Spoiler: the top of the trigger pack is not supposed to be slightly bent. The trigger is now functional and cocking it is much smoother. I must have somehow bent it while reinstalling those two pins.