Well, other than a nearly stock 1740, this is the only CO2 gun I have, so here goes.... I built it about three years ago, when Ken (ustilago) was making his Dual Power Hammers (DPH) for the 13XX and 22XX series guns.... This gun is a 2250 carbine, converted to an 18" long .177 barrel, and set up with a DPH, which allows full power, or reduced power (and great economy) depending on which of two hammer cocking positions you choose.... Here is a photo of the completed gun....

1750 DPH.jpg

While it may not look spectacular, the devil is in the details.... Yeah, it has a brass muzzle brake and barrel band I made, and the brass DPH.... and the skeleton stock has been customized to work better with the 2-7 x 32 AO Fitco scope.... However, it's the way this gun shoots that makes it special.... By playing with the low power range on the DPH (which incorporates an RVA) I was able to get the valve to be self-regulating over a WIDE range of temperatures.... What I mean is, the velocity stays relatively constant regardless of temperature.... Here is the proof....

1750 DPH9 Various Temps.jpg

On the "high power" setting, as the temperature falls, the velocity decreases, just as we would expect with CO2.... However, on the "low power" setting, the way I have it adjusted, the velocity is nearly the same (520-530 fps) at 46*F and 62*F, and only slightly LOWER (500-520 fps) at 75*F.... The gun also shoots about 500 fps right out of the fridge at about 35*F.... What changes with temperature is the number of shots, and that, again, is something pretty special.... It turns out that I was the first (and to my knowledge still the only) person to get over 600 FPE total energy from a single 12 gram CO2 powerlet.... this from Steve in NC (of HDD fame), who managed to get 552 FPE, and that was at 79*F.... At 75*F, I regularly get about 130 shots before the velocity drops off, at an average of about 510 fps with 7.9 gr. JSB Express pellets.... OH!, and by the way.... It will stuff them into one ragged hole all day at 10M if I do my part....

Bob