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I'm a retired mechanical engineer and have learned my lessons by burning out several HPA hand pumps and electric compressors over the years, primarily due to inefficient cooling of the components. Burn out a hand pump? I hooked mine up to a foot lever so I could just step up and then ride it...

Those metal pellet traps work fine to catch the pellets but are also very noisy. Just hanging a piece of thick cloth over the open face of the metal bullet catcher (behind the target) will slow the pellets enough to quiet it down a bit. And a cardboard box of old clothes as described above, or...

You're correct of course Matt. I got lazy about adding a % fpe change column for each pellet since they vary a bit and the spreadsheet would have provided accurate numbers. A power increase of about 1/3 is probably a reasonable rule-of-thumb on this particular power plant and settings. My...

While at my local propane supplier recently I noticed that they had 50cf and 100cftanks of compressed (1800psi) 'Balloon grade' for sale or rent. Back in the 1980s, I tested the increase in shot power for different airguns when run on Helium compared to air for posting on the old Yellow Forum...

This listing has been renewed

This listing has been renewed

This listing has been renewed

This listing has been renewed

** SOLD ** Final price reduction $750 which includes free shipping within the continental United States. It will ship in its original foam-lined Huben shipping box. I won't go any lower on the price and will keep relisting this one until it sells. For sale is a one-of-a-kind custom Huben K1...

This listing has been renewed

This listing has been renewed

This listing has been renewed

This listing has been renewed

** SOLD ** I purchased this Diana ZR Zero-recoil mount #41200401 from Optics Planet last year intending to mount it on a break barrel pellet rifle. The box was never opened and I no longer have any break barrel airguns to use it on. I'm offering this one for $50 which includes the cost of...

** SOLD ** I've had this Holosun HS507C X2 red dot sight for about three years. I used it briefly on an air pistol which I no longer own but mostly kept it as a spare. It includes an unused Picatinny mounting plate, a flexible rubber sight cover for protection, and the original product box...

** SOLD pending receipt of funds ** I've had this Holosun HS403B 2-MOA red dot pistol sight with a built-in high Picatinny mount for a few years. I used it occasionally on different airguns which required a high-mount red dot sight, but mostly kept it as a spare for quick tests of a new...

This listing has been renewed

This listing has been renewed

** SOLD ** I purchased this Athlon Optics Talos SFP 3-12x40mm scope with an illuminated BDC 600A reticle new last October. I mounted a set of quick-release scope rings on the scope so that I could briefly mount it on a rifle to sight it in correctly to check the view and the reticle. The scope...

** SOLD ** This Huben K1 .25 cal 17-shot adjustable-power semiautomatic carbine just came back from Krazcool where I had sent it for a pre-sale tune-up, and for the installation of an easy pellet loading gate. It is low mileage and in fine cosmetic and working condition. It includes one fill...