I finally got my stamp to sbr my 300 blk out. I am wondering if it would be worth the money to try a 9mm conversion and get a upper in sbr. I've read on the errornet it's split down the middle for likes and dislikes. Would like to hear if someone here has tried it and if it worked for them and what kind. How fun would it be to bring a 9mm sbr to a steel match. But how embarrassing and a waste of money to end up with a jamming pile of junk. I'm sure a dedicated lower would be much better..... Just not wanting to spend that much right now. Thanks for any help