Pros/Cons of a 3" Barrel 9mm AR with supressor - Page 1

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[ARCHIVED THREAD] - Pros/Cons of a 3" Barrel 9mm AR with supressor

Posted: 5/3/2017 12:56:14 PM EDT

I had a 4.5 inch 9mm ar a while back that I sold. I'm in the process of slow building one with some nice parts bit by bit(gonna form 1 so I have time)

I want to go shorter this time. A real compact pdw/truck gun

The plan is to use an pdw type stock like an mvb arc or so.

The barrel is where I'm stuck. Is going 3" too short? Also because I plan to suppress it (not always) just swapping between hosts. When not supressed I'd probably use a Flashcan or possibly one of those barking spiders.

Anyways back to the barrel. I've tried searching but all I keep finding is "3gun" or "3lug" stuff. Typing 3" 9mm ar doesn't yield much results. Or atleast useful results that is.

Can people who either have a short 9mm ar or have experience with one chime in.

Thanks.

Posted: 5/3/2017 3:43:56 PM EDT

[#1]

Look up the ballistic chart for 9mm, I don't have one handy, but they really start to drop shorter than 4" and the drop between 4 to 5/5.5 can be pretty significant

I would PM Rudy to get his thoughts, if anyone has experience with it - it would be him

Posted: 5/3/2017 4:09:36 PM EDT

[#2]

You will have a significant FRP.
Might as well go with a ~5" barrel with no muzzle device. A Flash can adds about 2.5" of length. With pistol powder being fast burning, a 5" barrel with no flash can might sound about the same as a 3" barrel with a flash can.

You'll take a velocity loss and with a flash can, not gain anything versus going with a 5" barrel.

I'd do a 5.5" barrel with a 4" rail and no muzzle device. With a 5.5" barrel, you'll still be able to put a can on it and clear the rail.

Posted: 5/4/2017 8:09:20 AM EDT

[#3]

I've got two uppers for my 9MM. One is a 3.5" and the other is a 7.5" Both barrels are from QC10. I like them both, but prefer the 7.5. It seems more balanced with my suppressor on it. It's reliable and shoots really smooth with a heavy buffer.

I might get another lower and turn my 3.5" into a pistol.

Posted: 5/4/2017 9:33:16 AM EDT

[#4]

5" is a s short as I would go personally.

Posted: 5/4/2017 9:37:20 AM EDT

[#5]

I don't really see the appeal of going that short, you can get higher velocities out of a handgun in a much smaller package.

Posted: 5/4/2017 12:56:17 PM EDT

[#6]

Yea going 3 isn't going to be easy anyway as there doesn't seem to be anyone who really makes a 3. Only like 1 place I found.

Posted: 5/4/2017 4:19:28 PM EDT

[#7]

I'm building a Faxon 4" and wouldn't want shorter than that

Posted: 5/4/2017 6:59:39 PM EDT

[#8]

Quote History

Quoted:
I'm building a Faxon 4" and wouldn't want shorter than that

View Quote

yeah i think im gonna go 4" anyway now.

Posted: 5/13/2017 12:56:30 PM EDT

[#9]

Just finished a 4 inch upper for my 9mm sbr.

I think it's perfect

I don't think I would go any shorter. I have a 7 inch lancer handguard and my 9k just pokes out the end.

Posted: 5/13/2017 3:56:19 PM EDT

[#10]

At that point id just get a glock 19 with a arm brace. No reliability issues.

Posted: 5/13/2017 10:37:09 PM EDT

[#11]

Quote History

Quoted:
At that point id just get a glock 19 with a arm brace. No reliability issues.

View Quote

Not really comparable. AR platform trigger miles ahead of any Glock

Posted: 5/14/2017 11:29:15 PM EDT

[#12]

Quote History

Quoted:
Just finished a 4 inch upper for my 9mm sbr.

I think it's perfect

I don't think I would go any shorter. I have a 7 inch lancer handguard and my 9k just pokes out the end.

View Quote

specs on your setup?
pics?

Posted: 5/15/2017 12:49:52 AM EDT

[#13]

Quote History

Quoted:

specs on your setup?
pics?

View Quote

Jp lower bought as pistol, form 1d into sbr. Silent captured spring. glock mags

Upper is a Spartan side charger with lrboh. 4 inch barrel. 7 inch lancer CF handguard. Not my first choice, but was $50

Omega 9k with 1/2x36 fixed barrel adapter. Topped off with a Sig Romeo 3 on high riser.

Runs like a scalded dog

Posted: 5/15/2017 11:24:13 PM EDT

[#14]

Quote History

Quoted:

Jp lower bought as pistol, form 1d into sbr. Silent captured spring. glock mags

Upper is a Spartan side charger with lrboh. 4 inch barrel. 7 inch lancer CF handguard. Not my first choice, but was $50

Omega 9k with 1/2x36 fixed barrel adapter. Topped off with a Sig Romeo 3 on high riser.

Runs like a scalded dog

View Quote

which barrel did you get..

i had a matrix side charger previously. but this time i got the NFA side charger with the LRBHO i didnt know the spartan had LRBHO but then again its just a rebadged NFA.

what buffer you running?

Posted: 5/16/2017 1:33:08 AM EDT

[#15]

Jp 9mm silent captured spring/buffer

[ARCHIVED THREAD] - Pros/Cons of a 3" Barrel 9mm AR with supressor

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