Built this and went a different way. New never fired. 


 


Satern 16″ Med 300 Blackout LIBERTY Button rifled barrel 1-7 5R $188


Guntech 15″ AIR-LOK Series M-LOK Compression Free Floating Handguard With Monolithic Top Rail cerakoted Sniper Grey $170


Seekins ATC muzzle brake $99


Generic gas block and gas tube


AR15, AR-15, 300 blk,