Some more Beeman P17 chrono results

Sounds about like mine. I ran about 4 or 5 rounds across my new little midget chrony just yesterday with mine and all five were just above 400 fps averaging close to 403 with the 8.68 gr H&N's

Cool little pistola!

Next time you have the piston out, take some metal duct tape and put 3 or 4 layers on top of the piston, then trim it off carefully. I have a P17 that was doing about 375 fps, and the tape trick took it well over 400 fps. Harder to close, though, but no biggie. I also made a 22 barrel for it out of a stock Crosman 2240 barrel. . I get about 350-360 fps with 22 Hobby's and its a tack driver. Original Chinese 177 barrel was machined off-center. See pic..