300 Blackout pistol recomendations/ suggestions?

[NH Phantom]

I'm waiting on a Q full nelson 7.62. Looking to put it on a AR type pistol chambered in 300 BLK. Thinking on a Sig MCX with 9.5" barrel. Would like to go with a piston gun also. Any other brand recommendations or reviews on this or any other of this type gun? Most reviews I've looked at seem bias.

 

[NH Phantom]

I could always build something if that’s a better route but wouldn’t know where to start