Steel works just fine in any gun I own... (Including my Glock) Especially works better in my foreign made guns, AKs, SKS, Glock's, Mauser, Berettas. I have used steel in my S&W 3rd gen 9mm w/o any problems. I don't own an AR but steel works fine in my Ruger Mini 14. You always need to clean the firearm well after any use anyway.

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John 1:17
NRA Life Benefactor