Glock 21 slide Options

[EWastigmatism]

I have 45's, and a G20. Rather than adding a G21, I am thinking of building/buying a G21 or G41 slide. There re not nearly as many options as with 17/19. I am weary of Rock Slide, and Lonewolf appears to be unavailable. Any experience that anyone can share would be appreciated. Not sure about Brownell's either. I am in no rush, but your perspectives are appreciated.

[Spyder]

What I did was buy a G21, sell my G20, and then buy one of the 10mm barrels that has a slightly wider breech and fits the G21 slide. It works perfectly.

I shot for quite a while with a KKM 10mm barrel in my G21. There was a small gap on each side of the breech, but it caused no problem. I shot side by side with my G20 and 21 slide several groups off a rest with different ammo and could find no noticeable change in group size. When I found the correct barrel (I can't seem to remember if it is KKM or Barsto or one of the others, but it's one of the few popular conversion barrel companies), I bought it and sold the KKM.