Just picked up this weapon up last friday and had a chance to hit the range today. Did not use the backstraps due to the longer pin breaking upon install of the medium strap.(not a big deal). Ran 200 rounds of 180grn federal ball ammo and 20rnds of 180grn hst. I was very frustrated due to the fact that the muzzle flip was worse than the 2nd and 3rd gen guns, and did nothing for recoil. I suspect that the dual recoil spring is to fix the problems with the lights that are attached to the rail as I noticed that the slide speed is much faster than the other g22's causing the muzzle flip to be worse than before. On a good note, the glock as always ran 100% as usual with no feed problems or problems with extraction. I'm not bashing the gun itself but am disapointed that glock changed to this spring set up. I have not shot the new gen4 17 and hope this is not the case with it. I did end up selling the gun due to the more muzzle flip but did buy a new g20sf to join my 2nd gen g20. I am not trying to tell you not to buy the new gen 4 as this is only my opinion.