Works for 300 blackout - UTG Pro AR-15 .223/5.56 10 Round Polymer Magazine

I needed some short hunting mags and I’m glad I stumbled upon these, they work for my 300 blackout loads, and also My 300 HAMR loads I like the fact that they will hold the ten and will cycle mine without any problems, I will be getting more of these, and maybe some 30 rounders, good product that functions. I like the fact they do not have ribs inside to interfere with bullet thickness binding, they have some other type of follower grooves that will not interfere. MG