George Dickel
Member
I'm wanting an AR in 9mm. My web searching shows that there are uppers in 9mm that will work with a standard AR lower and I've found lowers that are strictly made for 9mm. Brownells has this adapter for a standard lower https://www.brownells.com/rifle-par...apter-for-5-56-lower-receiver-prod117645.aspx to more stabilize the 9mm magazine. Are there too many problems going this route vs a dedicated 9mm lower? I have a .223 upper on the way and a completed lower for it. Looking to save a bit of money.