Congrats on the new purchase. Have lots of fun with it and above all else be safe. Plus pics are a must. Also welcome to the forum.
i have some steel cased 223 i might be willing to trade for some 9mm
Is it the one that was on the pile of sold rifles on the floor at 2A Sales on Friday?
Congrats on your new rifle
Be careful of steel cased ammo as they did a Test with it and found that it created premature deterioration of the Barrel and choked up the Gas tube. I would stick with Brass cased ammo even though you might have to spend more for it you will be thankful and your rifle will thank you.
It's not the Steel case that is the major problem, it is the powder and bullet used. Apparently when shot the combined steel and powder create a acidic cocktail along with the inferior bullet that causes the rapid throat erosion and premature Barrel destruction in less than 5,000 rounds but will choke the gas system earlier at around 1,600 rounds.