Best (most reliable) barrel length for a 9mm SBR?

B

BerdanSS

New member
I've been lusting after a 9mm AR SBR for years now. Something along the lines of a 9mm take on the MK18. I have a couple extra parts laying around I've been mentally holding for it, LMT SOPMOD, gasbuster CH and so on, but never really got down to it. Well my wife tells me today that part of my Christmas gift from her this year, is a small frame glock mag lower from Quarter Circle 10 that I've been drooling over for the last couple weeks.

Now doing a loosely based MK18, I was going to go with a 10.5" barrel. This carbine will not be suppressed all the time. But when it is it will most likely have a YHM wraith spun on it. Is 10.5" a good length for reliability both suppressed and un-suppressed? Are there any lengths that cause reliability issues for sure without heavy tweaking?
 
I'm in the process of building one now. It will 99 percent of the time have a huntertown arms guardian 9 on it. Im going with a 5inch barrel. My thought process was (even tho i do hand load ) 1) it will be easier to stay subsonic with the shorter barrel and 2) since it will have the can on the majority of the time I wanted a shorter overall package.

I've been looking at adco barrels the most in that length. Who all have you looked at?
 
I have a 10" barrel on a QC10 lower. Im going to start shopping around for a shorter tube. Like 5" or so. Since its an SBR it might as well be as short as possible.

As stated above the 9mm is a blowback system so barrel length will not effect operation, and the gas buster CH is wasted on a non-gas gun IMO.
 
Sharkbite

Ya I know the real purposes of the gas buster is a wash on one, I just have an extra laying around. But I'm almost debating using something more more like a mod 4 gunfighter....just because of putting W&T on the PRI with the price tag they have. I could keep it in reserve for my MK12.

I didn't think about the length being a non issue due to blowback :o

I've looked at ADCO, RRA and YHM. But I'm leaning toward an ADCO 7" now.
 
9mm is blowback, not gas operated, so any barrel length should function the same way.

Not even sure the "gas buster" CH is necessary.
 
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