I got my 19x080 red N-Forcer spring and it went together easily in my QB57. The N-Forcer people are nice and have really quick shipping.As installed, I put a spacer between the body and piston to get to basically zero preload rather than a gap. Is there a rule of thumb on gas springs? There is a clunk each cycle, so I think it needs a little extra spacing but it would be nice to just go back in once.It is smoking a little out of the barrel and dieseling, so I am doing a round of goo gone. It wasn't doing it before, so I suspect I picked up a few fps. The shot cycle is a lot calmer, so if it ever stops raining here I will see if I improved accuracy.
" Gas springs have some advantages over wire springs. I like them a lot so far. But they are not a cure all. Sometimes wire springs are more appropriate."For the non-experienced ( like me ) when would a wire spring be more appropriate? Also, I have heard that nitro-pistons have been prone to leakage, any thoughts on that?
I'm finally getting around to acquiring the gun to go with my Red N-Forcer 19 x 100 gas spring.... It's a Crosman Phantom in .22 cal, and I have a long piston from one of the Canadian detuned models where they reduce the stroke from 100mm to about 50mm to keep the gun under 500 fps.... The plan is to shorten the piston and cut a new sear window in it to set the stroke at just under 100mm.... My question is this.... What is the longest stroke I can use with that gas spring?.... 95mm?.... 97mm?....99mm?.... Scotchmo ?Also, what is your current thinking about which way to install the piston, with the piston rod forward, or the outer housing forward (more travelling mass) .... How much preload do I need (I assume that robs stroke?)....Bob
I have a feeling that the 125mm N-Forcer won't fit in a B-18/19 action.... but that's just a gut feeling.... Perhaps a custom ram with a 100mm body and a 125mm ram might fit if the full 125 won't?.... Scotchmo, do you know?....Bob
The B18/19 takes a 100mm. Why not just use a 100mm and space it a little to give preload?
QuoteThe B18/19 takes a 100mm. Why not just use a 100mm and space it a little to give preload? I may understand how you can use a 100mm gas ram better in a rifle that is normally 100mm stroke once I get the gun in my hands and look at it.... My plan is to move the sear notch in the piston to achieve the 94mm stroke.... Bob