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Posted: 4/21/2016 5:12:18 PM EDT
Just received my SBR approval. Going with an 11.5" barrel. What rail length do you recommend? Should I go with 12"-13" and have a portion of the suppressor covered by the rail or should I have a 10" rail so the suppressor is not covered by the rail? I'm wondering if I have it mounted somewhat inside the rail would get hot?

Thoughts or advice? Thanks!!
Link Posted: 4/21/2016 5:15:16 PM EDT
Link Posted: 4/21/2016 5:27:00 PM EDT
I enjoy my 9.5" Geissle MK8 with 11.5" ballistic advantage barrel and Gemtech Trek
Link Posted: 4/21/2016 5:30:41 PM EDT
Thanks for the catch on my post BigWaylon. Changed it, options are:

10" rail with suppressor exposed.....or
12"-13" rail with a portion of the suppressor covered

Link Posted: 4/21/2016 5:44:31 PM EDT
Link Posted: 4/21/2016 5:48:47 PM EDT
I recommend against a 5.56 can under a rail. It gets very hot.
Link Posted: 4/21/2016 5:59:42 PM EDT
I like a rail that's 1.5" shorter than the barrel. You end up with about 0.5" of barrel exposed, and it looks really nice.
Link Posted: 4/21/2016 6:04:41 PM EDT
I used an 11.5" barrel with an 11" rail. I like the near seamless look.

Link Posted: 4/21/2016 6:06:12 PM EDT
Link Posted: 4/21/2016 6:17:09 PM EDT
I shoot for about 1" to 1.5" difference between rail and barrel length to get a nice rail to can fit without interference.
Link Posted: 4/21/2016 6:23:34 PM EDT
One manufacturer's (x) length rail is not always the same as another, try and get specific specs if possible. I bought an Aero precision 12" rail that ended up being closer to 13" and had to modify my build plans because of it. I have a small portion of the suppressor inside the rail and I bought a direct thread can for this. This rifle has a dedicated can so it does not bother me. I haven't fired more than a full mag at a time but the heat hasn't bothered me yet.

Here is a comparison pic for reference. The top is a 10.3" Ballistic Advantage 300blk barrel with a Geissele 9.5" MK4 with a SiCo flash suppressor and Omega can. The bottom is a 12" Larue Stealth barrel with a direct threaded Griffin Spartan 3 and Aero Precision 12" rail that was more like 12.6-12.7". The Aero rail has a 1.8" ID so it has the room to have the can inside. Most manufacturers do not recommend running a can under a hand guard and I would not do it if it were more than what I am covering.

Link Posted: 4/21/2016 8:35:44 PM EDT
For reference, here is a 12" LaRue Stealth barrel and a SLR 11" Solo Ultra Lite EX M-LOK Handguard with an Omega Thread On:

Link Posted: 4/21/2016 9:39:55 PM EDT
Thanks all. Decided to go with a 10 or 10.5" rail to have the suppressor outside the rail. Reduce rail heat and make it more accessible. I have a Kestrel direct thread so should make it a pretty seamless look using a slimmer rail which I prefer.

Nice pics by the way, some great rifles there!
Link Posted: 4/21/2016 10:06:16 PM EDT

10" SLR rail with an 11.5" Ballistic Advantage barrel.
Link Posted: 4/22/2016 12:51:56 AM EDT
On the left,11.5 with a KMR 10.
Link Posted: 4/22/2016 3:09:30 AM EDT
9" or 10"
Link Posted: 4/22/2016 6:06:19 AM EDT
10.5 or 10.75.
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