Figured I'd bounce this off you guys... see what you thought. Right now Im planning on doing a 5" TROS 3-lug barrel on my new 9mm AR built and then have a Lancer Midlength Carbon Fiber hanguard over that. Goal was to keep a whole bunch of whatever surpressor i go with hidden under the handguard (MAY even go rifle length and make it damn near flush). That being said.... how hot does a 9mm can really get? I have plenty of 5.56 rifles and a can to go with those... and both the barrels and the can get insane hot.... even though about cooking bacon a few times. But with all my 9mm pistols... even when going through mags really fast, never get that hot. Well.... they get warm/hot but nothing even close to the 5.56 and you can still handle the barrel with bare hands. So with that being said.... it seems like a 9mm can would be pretty similar... just get on the upperside of warm.... but nothing that you couldnt handle with a bare hand. Any truth in that or is my logic bat shit backwards?

And if it does get much hotter than something you can handle with a bare hand... how would a carbon fiber hand guard handle the heat? After going through the dimensions with Lancer and how I'd configure the handguard, the inner diameter at the very end would be 1.562" So with a SWR Octane, I'd have .09" (2.2mm) clearance around the surpressor right at the very end of the handguard (where the embeds for some small rail pieces would be) and with a AAC Evolution, I'd have 0.156" (3.9mm) around the can. I think the clearance with the Evolution is doable... the Octane is gonna be REAL tight!

Thoughts? Also, know of any other cans on the market that have a 3 lug mount and are closer to 1.25" diam rather than 1.375" diam?