I am working on building 8.5" 300BLK SBRs.  Trying to decide if I should go with an over the suppressor handguard or go for a shorter and thinner rail.  I am not in a hurry to complete this project as prices will be better in a few more months and I am still waiting on YHM to produce the LT or LTA suppressor.  

This rifle will primarily be a range toy and I don't see myself shooting it unsuppressed.  My main concerns with putting the suppressor under the rail is heat and added weight.  I like the idea of longer sight radius, longer grip range (until the suppressor heats up) and shroud around the suppressor in case of unintended contact.

Please let me know what your experience has been with suppressors inside and outside handguards and what you found to work better, thank you!

I haven't taken the shrouded route, but I do know that it can make QD type cans difficult to remove. Not a big deal if you plan to never take the suppressor off and/or dedicate that suppressor ONLY to that host.

Not having the latch is one of the reasons I am waiting on the LT/LTA instead of the SDN-6.  That and the large cost difference in the suppressor and mounts.  I have seen someone cut a support piece out of a BAR to allow access to the latch under the rail.

If you are never shooting it unsuppressed then I like the under the rail look. I wouldn't do it on a .223 can due to the heat. I'm not sure if a .300 will generate as much heat shooting subs. There are a couple rails that might allow you access to the tab to remove the suppressor. I have one SBR that is 9mm where the can is buried deep into the rail, but I don't expect heat to be much of an issue, though I could be wrong.

I put one under a PRI once. It gets warm. I sold it.

Good setup for a house gun, not for a lot of shooting.

Shooting sub 300 in my 8.5"/N6 stays way cooler than supersonic. I would imagine a shrouded 300 would be very doable if mostly shooting subs.

Shrouded is awesome on 300blk!

I would rather have access to be able to clean the mount without removing the entire rail.

Also, on my rifle can I use a silicone sleeve, which offers much more thermal protection from a hot can than an aluminum hand guard would.

I've got a YHM Wraith XL under a rail on 5.5 inch barrel and have no problems with heat.    147s in this SBR = smile machine

.22 Sparrow under BAR Rail







YHM Stainless 5.56 under BAR Rail

9.5" 300 blackout barrel with YHM Phantom QD SS uner Midwest Industries 15" rail. I only shoot subs and dont notice much heat build up, I also dont blast away. I keep my hands on the XT panels, not foreward on the ladder covers as that is the end of the barrel in case of an accidental kaboom. I do like the extended sight radius and shrouded look, mostly why I built it this way.

My dust cover is also laser engraved with ".300 AAC Blackout" as a safety precaution. I recomend that with all non-standard uppers.

It's personal preference, but in my opinion it's a bad setup. It adds weight, retains more heat, and it puts your hand in front of the muzzle.

That is important. Depends on the can too. A baffle strike in a Surefire will still put the can out the end but in a can with an assymetrical baffle stack it will pop out the side.