You might check out some of the postings on the Glock Talk Forum on installing the recoil system. I think I read that some individuals ran into issues with rounds not cycling through and feeding jams.

Here is a link to one thread: http://glocktalk.com/showthread.php?...ght=DPM+recoil

There is also a lot of lessons learned info on changing recoil springs and recoil spring guide rods available there.

Good luck...

I've read mixed results about other brands on guns before. I don't think it is worth it. If U are having recoil issues - try backing down in the caliber dept.