I skipped from page 1 to 7. however that being said. All ar's should have the ability to run steel ammo.
The email is to cover them if the rifle blows up using steel.
Their is no issuie when using steel ammo- its what some only use- Ive shot over 1500 rounds out of my ar without a single failure. and thats using tula
And dont believe for a second that running steel ammo will in anyway hurt the rifle. Ive seen rifles that have shot nothing but steel have well past 20k rounds put threw them with only throat erosion.