I would think that at 600 rounds that the slide is loose enough it is moving freely, so looking for other sources of friction makes sense. In no particluar order you could try the following:
I have a bit of suspicion that the aluminum cases don't slide as smooth as brass, so simply changing ammo may fix it.
Polishing the feed ramp is not a difficult or dangerous thing to do. I used 400 grit wrapped around a shell casing and just took off the roughness. Use it wet so that the grit does not load up, then follow up with 600 grit. You are not changing any shape, just making it smooth.
It may be that the chamber is rough too, and catching on the case. I have never had to tinker with the chamber but others have. A felt bob with the Dremel is usually suggested, if you don't have a Dremel the same tool can be used in a normal drill motor. Polishing compounds or Flitz can be used.
I have noted on my HS2K/XD pistols that the factory spring assembly is just barely enough to counter the striker spring, so a heavier recoil spring may seat the slide more firmly. Even a 18# spring (stock weight) on an aftermarket guide rod seems to have more force in closing the slide. I don't like to suggest my guide rod in this forum since I profit from it (at least I get beer money for the weekends), but since you can by other brands I don't feel like I am just doing this for selfish marketing. I would think that any of the guide rod offerings should help.
I have a bit of suspicion that the aluminum cases don't slide as smooth as brass, so simply changing ammo may fix it.
Polishing the feed ramp is not a difficult or dangerous thing to do. I used 400 grit wrapped around a shell casing and just took off the roughness. Use it wet so that the grit does not load up, then follow up with 600 grit. You are not changing any shape, just making it smooth.
It may be that the chamber is rough too, and catching on the case. I have never had to tinker with the chamber but others have. A felt bob with the Dremel is usually suggested, if you don't have a Dremel the same tool can be used in a normal drill motor. Polishing compounds or Flitz can be used.
I have noted on my HS2K/XD pistols that the factory spring assembly is just barely enough to counter the striker spring, so a heavier recoil spring may seat the slide more firmly. Even a 18# spring (stock weight) on an aftermarket guide rod seems to have more force in closing the slide. I don't like to suggest my guide rod in this forum since I profit from it (at least I get beer money for the weekends), but since you can by other brands I don't feel like I am just doing this for selfish marketing. I would think that any of the guide rod offerings should help.
