Effective comp - Agency Arms 417 Glock 17/19/34 Gen4 Compensator

Purchased one for my Glock 19 Gen4 with S3F threaded barrel. Installation was easy. Shot about 400 rds (various 115gr and 124gr), it worked flawlessly with the factory guide rod. With a lighter 15lb recoil spring and the Glockstore tungsten guide rod, the gun shoots even softer and flatter. The hotter the ammo, the flatter it shoots (S&B and +P).
Note: often times the slide doesn't lock back when the mag is empty although the gun cycles just fine.
The overall setup fits in my Glock 34 holster.