deadpair71 Check out the Military Arms Channel on Youtube. Mac has made several modifications to what was originally a Scorpion pistol. He now has a carbine handguard housing a suppressor. He reports absolutely zero heat problems with a shrouded handguard. That's the way I'm going, except Mac is using a stock carbine length handguard and I've installed an HBI free-float version, mainly because I want to use a 3-Lug mount and that's difficult with the stock handguard with its barrel nut. I have the carbine Scorpion now, and once my SBR Form1 is approved I can install a shorty barrel and I'll be complete