You really need to sit down and do some research ....A Powder Burners recoil is MOSTLY the rapid acceleration of the bullet follow by muzzle blast.A spring gun you feel the mechanics of the spring driving piston, its sudden stop BEFORE elvis has left the building.A SSP Single stroke pneumatic is likely the closest in Physics of where recoil comes from, but due to far less bullet / pellet weight and power/ lack of muzzle blast there actually not even close either.Confused yet ?
The PI (HW45) is in a class of its own on how to shoot with accuracy due to its recoil. Compared to shooting a 1911 in 45 Auto, I rate it a harder gun to shoot for the sake of accuracy. That is not to say it isn't accurate. It's actually very accurate in and of itself. It just a fairly demanding gun to shoot. The HW75 is the single stroke pneumatic and a much easier gun to shoot, right out of the box. Has a similar feel to a big semi auto pistol, too, just like the P1. Outstanding trigger, just like the P1. Lifetime quality, too, again like the P1.