I shot about 150 rounds of their .40 at the range in my Glock they fed extracted and fired fine. No more "fouling" than anything else. The only problem I experienced with the Red River Ammo was that every one of them the Glock striker pierced thru the primer face. EVERY one of them. Couldn't tell you if it is their primers or the spring in my Glock(which as far as I know is factory) Any other ammo I fired thru my Glock had a nice deep striker impression. Any comments RedRiverAmmo? I probly should have contacted them but did not know they were an actual local entity, excuse my ignorance I'm still learning my Oklahoma geography. I still have the brass if you guys would like to take a look at it.