9mm AR SBR questions

[rouchna]

The heavier the better. Heavybuffers.com makes them to the proper length. If your buffer is too short it can break bolt catches. You want them to just clear the bolt catch.

The best spring for these are this:

http://www.brownells.com/rifle-part...yle-308-chrome-silicon-springs-prod22336.aspx

Don't cut them, just install it and enjoy a spring that lasts 500K cycles and has a softer impulse that does not over compress.

Everything changes if you use a shorter stock like a LWRC UCIW Stock Assembly because they use shorter buffers. like mine:

Thanks for the reply. Your build had a lot of influence on my wanting to build mine. Great work as always I'll be ordering that spring for mine.

I run the Q9 heavy buffer from heavybuffers.com. My 9mm AR is my favorite gun to shoot.

Thank you. They're a bit pricey but if they work, I'll buy once and cry once.

 

[dontpanic]

Thanks for the reply. Your build had a lot of influence on my wanting to build mine. Great work as always I'll be ordering that spring for mine.



Thank you. They're a bit pricey but if they work, I'll buy once and cry once.

Keep an eye on Gunbroker. Last week a Heavy Buffers Q buffer (thier 9mm) with a Wolf spring went foe $61

I have seen CMMG bolts there for $175

 

[aaronn]

I've been using the buffer and spring that came with my no-name 9mm upper. Now that I switched to the VLTOR 7-position buffer tube I threw a rifle-length spring in there. Haven't shot it yet. I need to go over the options with my gunsmith who's currently working on it.

 

[clandestine]

I've been using the buffer and spring that came with my no-name 9mm upper. Now that I switched to the VLTOR 7-position buffer tube I threw a rifle-length spring in there. Haven't shot it yet. I need to go over the options with my gunsmith who's currently working on it.

Hopefully your Smith knows the 9mm AR platform well, because if he/she does not, it can be a hair pulling endeavor.

 

[aaronn]

Hopefully your Smith knows the 9mm AR platform well, because if he/she does not, it can be a hair pulling endeavor.

He's a very well-regarded IP here. I'm pretty sure he knows his stuff and he's the type to admit when he doesn't. We'll run it once he chops the barrel and make the necessary alterations to buffer/spring then.

 

[rouchna]

I run the Q9 heavy buffer from heavybuffers.com. My 9mm AR is my favorite gun to shoot.

My Q9 heavy buffer was delivered yesterday. Man, that thing is quite heavy.
Another question: Will the standard 5.56 BCM Gunfighter charging handle work with the CMMG MK9 ramped bolt?

 

[teratos]

My Q9 heavy buffer was delivered yesterday. Man, that thing is quite heavy.
Another question: Will the standard 5.56 BCM Gunfighter charging handle work with the CMMG MK9 ramped bolt?

Yes, it is what I have in mine.

 

[rouchna]

Yes, it is what I have in mine.

Thank you

 

[rouchna]

A YHM 7.62 will allow suppressor use on a 9mm carbine. You have to modify the YHM 9mm Q.D. mounts to accept the .30 Q.D. can, but its doeable. The one I modded had a bore of .398.

YHM does not like that being done though.

As I'm shopping for parts, another question came up:

Will any 7.62 flash hider/comp work with a 9mm? I am mainly building this to shoot it suppressed, but I also want to be able to shoot it unsuppressed when I want to. I figured the flash hider would add to the length and clear the rail. AAC doesn't make a flash hider that will allow the Tirant 9 to thread directly on it.

thanks.

 

[MACTHEGUN]

The heavier the better. Heavybuffers.com makes them to the proper length. If your buffer is too short it can break bolt catches. You want them to just clear the bolt catch.

The best spring for these are this:

http://www.brownells.com/rifle-part...yle-308-chrome-silicon-springs-prod22336.aspx

Don't cut them, just install it and enjoy a spring that lasts 500K cycles and has a softer impulse that does not over compress.

Everything changes if you use a shorter stock like a LWRC UCIW Stock Assembly because they use shorter buffers. like mine:












OAL 21.00" Stock Extended/ 17.75" OAL Stock Collapsed


Nodak Spud XME16 Partial Fence Lower Receiver (Form 1 SBR)
Magpul MBUS Pro Sight Set
Gear Sector Hand Stop
MFT React Short Vertical Grip (Shortened to blend with the Hand Stop)
YHM Spectre 9.675" Lightweight Free Float Rail (Chopped and Faced)
ADCO 4.5” Barrel 13.5x1 Left Hand Threads
CMMG MK9 Ramped 9mm Bolt (Works with Standard AR15 Hammers)
RRA 9mm Upper Receiver
Ranier Arms Raptor Charging Handle
HK 4 Prong 13.5x1 Left Hand Flash Hider (Not Shown)
13.5x1 LH Thread Protector
Attach Clearing Rod (Not Shown)
Magpul MS2 Sling (Not Shown)
Heavy Buffers U9 UCIW 9mm 8.5 oz Buffer
Hahn TOP Loader 9mm Adaptor without BHO
Colt 9mm Bolt Catch
DPMS Lower Parts Kit w/o FCG
Gieselle SSA-E Trigger
Magpul MOE K2 Pistol Grip
SBR and 9mm Engraving
Superior Shooting Solutions Rifle Length Flat Wire CS Buffer Spring
Double Star Dual Sling Plate
UCIW LWRC Stock
Noveske STS 60 Degree Ambi Safety
Throated Barrel
Polished Bolt Tail
Polish Bolt Underside
Tuned Extractor
Cut and Polished 9mm Adaptor Ramps
Bedded Barrel to Receiver
Trued Receiver Face
Polished Hammer Face

Please forgive me in advance but I have every intention of cloning that sexy little tart when my M16A1 is paroled from the Federal pokey.

What a beautiful machine!

 

[teratos]

Please forgive me in advance but I have every intention of cloning that sexy little tart when my M16A1 is paroled from the Federal pokey.



What a beautiful machine!

I shot it. It's F'ing awesome.

 

[MACTHEGUN]

I shot it. It's F'ing awesome.

I'm sure!

Does it have a DIAS (great candidate)?

 

[clandestine]

As I'm shopping for parts, another question came up:

Will any 7.62 flash hider/comp work with a 9mm? I am mainly building this to shoot it suppressed, but I also want to be able to shoot it unsuppressed when I want to. I figured the flash hider would add to the length and clear the rail. AAC doesn't make a flash hider that will allow the Tirant 9 to thread directly on it.

thanks.

Normally , NO. You would have to have the 7,62 Muzzle Device bored out to allow the 9mm to pass through. You would also have to have the barrel threaded in something like 5/8-24 which is a common .308 thread.

For a Tirant you will have to get a piston in whatever thread you have (1/2-28, 13.5x1, or 1/2-36) and then get a FIXED piston spacer. It replaces the piston booster and only costs $20.00. If you want a muzzle device on it when the can isn't installed youll have to look for one in the above thread patterns.

I mentioned the YHM .308 can going on a 9mm by using a YHM 9mm Q.D. mount, BUT the 9mm Mount has to be modified to allow the YHM .308 can to attach.

 

[clandestine]

Please forgive me in advance but I have every intention of cloning that sexy little tart when my M16A1 is paroled from the Federal pokey.

What a beautiful machine!

Thank you very much. Your RR M16 would be damn sweet with that setup.

I shot it. It's F'ing awesome.

The trigger haunted you and made you spend lots of loot.

I'm sure!

Does it have a DIAS (great candidate)?

No RDIAS, but one day it will.

 

[teratos]

The trigger haunted you and made you spend lots of loot.

I will never forgive you.

 

[MACTHEGUN]

Thank you very much. Your RR M16 would be damn sweet with that setup.

No RDIAS, but one day it will.

Absolutely! Looking forward to it even though I've got lot's of trigger time in my former life as it's the gun I grew up with.

I hope you get a chance to score that RDIAS (prices have gone absolutely nuts of late)!

 

[MACTHEGUN]

I will never forgive you.

Somehow, I am perceiving that as a facetious remark.

 

[rouchna]

Normally , NO. You would have to have the 7,62 Muzzle Device bored out to allow the 9mm to pass through. You would also have to have the barrel threaded in something like 5/8-24 which is a common .308 thread.



For a Tirant you will have to get a piston in whatever thread you have (1/2-28, 13.5x1, or 1/2-36) and then get a FIXED piston spacer. It replaces the piston booster and only costs $20.00. If you want a muzzle device on it when the can isn't installed youll have to look for one in the above thread patterns.



I mentioned the YHM .308 can going on a 9mm by using a YHM 9mm Q.D. mount, BUT the 9mm Mount has to be modified to allow the YHM .308 can to attach.

Thanks for the detailed response. Looks like I'll just have to remove the flash hider anytime I want to suppress it. This has been quite the learning experience.

 

[rouchna]

Another question for you fine folks. I bought a 9mm muzzle brake so that I'm able to shoot this while waiting for my suppressor to be approved. As you can see by the photo below, one of the ports on the brake is inside the handguard. Now I know that 9mm doesn't produce a lot of flash, but should I be worried about ruining my handguard? A friend of mine on the forum brought it up and it's got me thinking. I'm obviously going to put a handstop so that I don't ruin my hand



Let me know your thoughts. Thanks.

 

[clandestine]

I've seen handguards blow apart from things like that BUT they were 5.56.

I wouldn't do it, but you might get away with no damage. May.