Shameless sponsor plug (Mid State Firearms)

[aTotal360]

Just ordered a shrouded (side charging) 300 blackout upper from them. Amazing service. If you have any questions about your build, call their number and they'll get back to you pretty quickly. They are more than glad to walk you through all the details so you're not trying to put a square peg in a round hole.

https://midstatefirearms.com/contactus.sc

Now I just need my tax stamps to get here...