I have the Warren Sevigny (.215" green fiber optic front) on my 17, and like that set-up. For my Gen4 34, what front should I use for GSSF if I'm shooting the Atlanta Arms & ammo 147gr GSSF load, the .215" or .245"? Also, I now have a MGW rear sight pusher. Any issues with installing these myself? I have installed the Ameriglo I-dots just fine on a couple of my Glocks, but I'm wondering if these require fitting, instead of just pushing them in. Thanks!