I know I posted this before, but I didn't get any responses. I'll try it one more time. I was interested in getting a KKM Glock 21 drop-in to 10mm 6" barrel soon for my 21SF and was interested in any feedback on how this set-up has worked for others shooting 10mm in this particular configuration. I have a SS non-captured guide rod with a 22lb. ISMI recoil spring and have secured some 15 round G20 mags. Any feed back on reliability and accuracy with this put together on a G21SF? Thanks.