omg I just looked up the bstaley mod! I’ve already seen this and forgot about it!!! Thank you!I find the nylon hammers to be quieter than the metal ones, but JSAR's will be too heavy for your use at that low a regulated pressure (they run about 34 grams or so - heavier than the Hill hammer). In truth, even Hill's ~25 gram aluminum hammer is probably too heavy for a short dwell time on a 1300 psi regulator setting. People used to make custom weight nylon hammers back in the day when the Marauder was the hot ticket, but no so much anymore . . . I have not used Hill's stuff - I've only seen pictures online - but maybe you could drill out the vent holes in the hammer to lighten it up some. I'd want to get it under 20 grams for what you are doing, maybe even down to 15 grams or so.
Another path you could try would be to actually put a stiffer return spring in the valve - that should help counteract the hammer strike and shorten the dwell time. Almost nobody talks or thinks about doing that, but that is because most are going in the opposite direction you are (going for more power / higher pressures).
Honestly, I find the quietest operation at a given power level from well tuned guns tends to occur at higher pressures, not lower pressures. This is because the higher pressure air pulse can actually involve less total air release as the pellet accelerates faster on it with less total air released - the lower pressure pulse has to last longer. When you say the gun was louder at the higher regulated pressures, was the loudness from the muzzle blast or the mechanical action.
I have JSAR's balanced valve, and I do like the latest version. But at the low regulated pressures you are running it really does not offer you any advantages - you'd probably need an even lighter hammer to get the dwell down where you need it. The main benefit of a balanced valve is that they open with a lower striking force, and you really don't need that for what you are trying to accomplish - a "normal non-balanced valve" would be best in your case. I can tell you that my JSAR valve is in a Gen I .25 caliber shooting 25.4 grain pellets at ~910 FPS for about 47 FPE, regulated at 1900 psi, with a 36 gram hammer (with striker), BSTALEY buffer o-rings, and a transfer sleeve and barrel port of 0.185", uses the JSAR TSS/SSG, and it cocks effortlessley . The BSTALEY buffer is something you could try too with the Hill hammer you have, as it will help manage some of the excess hammer energy - I found better results in my .25 with the heavier hammer and the buffer than I did with either a 20 or 25 gram hammer without the buffer (and could not make the power I wanted with the lighter hammers with the buffer). You san search on here for more info on the method if you are interested.
Regulating the gun will always do more for reducing ping than any depinger will, although some of the depinger designs are better than others. Hopefully Huma will sell you a plain smaller plenum, although having a spare regulator is not a bad thing if they won't - they all need rebuilt every so often, and having one ready to go in a swap is nice to have on hand when you need it - then you can rebuild the other reg at your leisure.
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