I am looking into a 9mm AR and would like the can under the rail.

I have a ti-rant 9mm. They are 1.375", right?

Is an ALG EMR going to cut it too close?

Length
10


Outer Diameter
1.75


Dimensions
10" L x 1.75" W


Inner Diameter
1.46" W x 1.63" H


Weight
6.19 oz

You might be able to get a sheet of paper in there.

That's way too close in my book. Any amount of deflection on the rail and I think it'll be touching.

I agree with GP. I use my octane under an aero precision m4e1 rail that is 1.8" ID I believe. I prefer the extra clearance.

I have a mcsr v2 and that rail heats up quick.. So while you can i would try to get something bigger.

If i had to do it again i would not tuck much of the suppressor under the rail and do yourself a favor attach a 3 lug to the barrel..

Just realized you're looking into a 9mm AR, and that you don't own it yet. If you haven't fired one yet, be sure to try before you buy. I don't like the recoil impulse from 9mm ARs, and I'm not alone on that. Engineer had some good thoughts regarding suppressed 9mm SBRs here: https://www.ar15.com/mobile/topic.html?b=6&f=20&t=453403

Food for thought.

I guess i missed that too.. I would pass on the AR9.. Its a giant turd of a system imho.. ITs heavy, Slow, problematic if you try to trick it out.. For the money i have invested in mine i could of got another mp5..

I have a bunch of sub guns and the AR9 is the worse.

Tag for reading
Thanks,

Idea was a QC10 lower, 5" barrel either 1/2x28 or 3 lug. LWRCi compact stock or such

0.085" difference. that's more than 1/32 on either side.


IMO that's enough..
You can always ream out the handrail for the area where the suppressor will sit if you're concerned.

I'm using an Odin Works rail...

Thanks for the feedback guys. Definitely not what I wanted to hear about 9mm ARs in general but it makes sense. Maybe I need to look again at a Skorpion for 2016.

If I had the disposable cash, I'd get a B&T APC9.

In my experience the plus side of a AR9 is you can build it in pieces like a normal AR. Can SBR it and have multiple uppers (8.5" and 5"SD look sunk under a rail for example) with the benefit (as perceived by user) of changing grip and stock and trigger as desired. The price is also much less if you build on sales as opposed to even the least expensive MP clone. That said, side by side a MP5 is just super smooth. I haven't gotten behind a CZ Evo with a stock yet but imagine is very smiliar to the AR due to blowback design. Benefit there to me is side folding stock.

I wouldn't replace my AR9 now (even built second upper for it) but if I want going between AR9 or scorpion, I would lean towards scorpion as my first blowback 9mm just because of how different they are and side folding.

I'm terrible at saving so this is a big appeal to me

This. I hate my friends AR9.  It seems like it has more recoil than my 556 and 300blk.  

Also I remember seeing an ALG rail with an Octane inside it somewhere.

I sold my 9mm upper and parts so I can start putting away for a Scorpion in 2016 since they are finally coming out in 1/2x28 thread

I LOVE my AR9!!  I have way too much $ into it, but it is one of my favorite guns to shoot.  Shooting subs with an Octane45 or a Trident 9 makes me giggle every time!

I would highly recommend building one and forget these fuddy-duddy nay-sayers

I use a Quentin Defense rail and upper and it feels just right to me.

How about a little encouragement??

Would a side charging upper be any different?

I use a Rainier Force handguard with the suppressor under it. My can is only 1.25 OD, but there is plenty of room for larger. I'm two months pending on a Mystic X and it'll fit with lots of room to spare.
I'll admit that I was somewhat disillusioned with my 9mm AR at first. It was always reliable and was accurate enough, but it just felt clunky. The "sproing!!" was intense too. It was off putting enough, that I wasn't excited about spending the money to SBR the thing. I wanted to like it though, so I sought to address those issues. I built my own, much higher mass version of JP's captured recoil spring system and then removed the tungsten weight from the bolt. The receiver extension that came on the gun (bought my 9mm AR as a complete gun on the EE back when DDLES the only small magwell lower and hard to get) was super rough on the inside, so I bought a better one that is glass smooth. These two things really transformed the gun into something far more entertaining to shoot. It's not nearly as smooth shooting as a well tuned gas gun, but it's so much better that I not only SBR'd and suppressed it, but I built a second upper for it as well. I'm not making a case for picking a 9mm AR over the other guns mentioned in this thread, just suggesting that they are not all the same and can be very worth while.

I am literally in the same boat.  Building on a ddles, have a tirant9 and aac 3 lug in hand, with a 9s and 45m pending, and want to use a 10" alg v2. Was going to pick up a jp bolt and silent captured spring soon.

Ive considered the Sig mpx but I am dead set on using my extensive collection of glock mags.

This is an important note too

In for answers.


I have a couple of the seekins rails, but kinda burned out on them. I saw a pic online of an ALG rail with Tirant 9 and it was a tight fit.

May try anyway

My first AR 9mm build started with a Spikes 3-Lug 5" barrel and a Seekins MCSR v2 10".  The rail covered up a 3-Lug Gemtech Multimount and a 3-Lug Octane nicely:


But...I wanted something shorter and lighter.  For my 2nd 9mm upper build, I got a 5" TROS 3-Lug barrel and decided to go with a shorter 5.5" Odin Works rail.  The build feels a little lighter but feels much shorter...less bulky...even with a full length can.  With a TiRant 9s...it feels just right...short, light, and decent suppression.  The suppressor is a little more exposed..but to me...it just feels right.

Next time you're up north drop in and road test my 10.5" off a DDLES / now QC10 lower. Open & suppressed. I did it on a budget with spare parts i had (H/T/S, rail, stock, etc) The bbl, bolt and lower were purchased new, kept it under $550.

With the SDTA Pistol can, i might crack off and buy a strike ind rail, Keymod or M-lok

http://www.strikeindustries.com/shop/index.php/products/rifle-accessories/ar/handguard/megafins-xl-rail-with-mlok-7-10-11-12-15-16-25-17.html#.VlU2DuLE9dg

this one

http://www.strikeindustries.com/shop/index.php/products/rifle-accessories/ar/handguard/ar-mega-fins-key-mod-handguard-rail-g2-7-9-10-12-13-15-12-5-fsp-c.html#.VlU2WeLE9dg

I also didn't care for my PCC AR. Granted, mine was a .40sw, but there was just too much mass flying back and forth for it to be any fun. I wanted to love it, but I couldn't.

YMMV.

I have a JP 9mm SCS in my lower and it really mitigates the sharp impulse.  Not as soft as a AR 22LR, but less impulse than a 9mm buffer(even with the Slash heavy buffer) and just enough recoil that it doesn't feel like a toy...its pretty fun to shoot suppressed.

I think this is exactly how I am going to do mine too.

I have an AR9, and am replacing it with an UZI semi. This should alleviate the problems I'm having with the AR-9 of mags being hard to insert and stay in, as well as issues with feeding HP.

If you're worried, you could always go with a larger rail. I run a 1.75" subgun  can under a YHM rail. A 1.375" can has all sorts of room.

You could always go with a shorter rail if you want it lighter.