Making a mess of my 1720T project, help!

Then back the throw off a quarter turn and lean on the hammer spring to bring the velocity back up to where it was. Your getting closer. It wont fart when you hit the sweet spot.

Agree. It does take some chrony time working with the O-ring buffer for the first time. Small changes on throw, can make big changes in the output. It is also easy to turn in the throw so far that you are not even using the buffer. Anyway, take your time, you will get there. 
 
Then back the throw off a quarter turn and lean on the hammer spring to bring the velocity back up to where it was. Your getting closer. It wont fart when you hit the sweet spot.

Agree. It does take some chrony time working with the O-ring buffer for the first time. Small changes on throw, can make big changes in the output. It is also easy to turn in the throw so far that you are not even using the buffer. Anyway, take your time, you will get there.




you guys are right!! It definitely took Some time and listening to the gun to figure out where the sweet spot is and I think I found it. For me it’s a little less than 1 then from the Ed counter clockwise wise or all the way out. 


got it to shoot 7.8 grain crossman at 780fps @ 2900 psi to 820fps @ 2400 psi and dropping off at around 2000 psi at 780 FPS again. I manage to squeeze out 35 shots in that range with little to no POI change. Super happy about how flat and accurate it is shooting. If I do my part it has no issue apstacking pellets at 20 yards. The 10.3 grain hades seems to be even more accurate at 700fps.



super stocked on how well it’s shooting and all thanks to all of your help. Really really appreciate all the insight and pointers! I can’t wait till my folding AR stock gets here from New England air gun. This is my new go to backyard gun once the stock is on! 
 
Crosman OEM Part #s...

2220-014 P-Rod TP

1720-014 1720T high power TP

1700-014 1720 low power TP

130-036 TP seal

These parts are only a couple of bucks each from Crosman.

You dont need a hammer spring because you already have the OEM 1720T factory spring that you use.

When done fill to 2800-2900psi to tune just with HST adjustment for a flatest possible shot curve and once set perfect you may fill to 3000psi.

If you insist on installing a regulator you are on your own and are introducing a really money wasted unnecessary variable to the gun that's one more thing to go wrong with the potential dreaded unexplained unexpected unwanted first shot reg creep (Yep even HUMA) that misses your target rather than perfect dead on 100% from shot #1 till the last unregulated shot.




parts ordered also, maybe I can squeeze out a few more shots.