There is alot of variables when it comes to barrel length vs speed so theres no real once size fits all, you can estimate and theres some general rule of thumb "x fps for y inches of barrel" you can...
Type: Posts; User: 6.5 CRD
There is alot of variables when it comes to barrel length vs speed so theres no real once size fits all, you can estimate and theres some general rule of thumb "x fps for y inches of barrel" you can...