9mm AR SBR questions

[teratos]

Used a CMMG ramped bolt and it has a Spikes LPK. It had a Spikes Battle Trigger before the Geissele went in.

 

[pwoolford]

Used a CMMG ramped bolt and it has a Spikes LPK. It had a Spikes Battle Trigger before the Geissele went in.

She is a beauty! I love the Ace stock also!

 

[traveller]

Is there any suppressor one could weld/solder to the barrel permanently to fulfill the 29in requirement with a 5.5in barrel ? (in a setup that allows some disassembly for cleaning)

 

[ducrider45]

I keep remembering stuff. My barrel is threaded 5/8 x 24. I had to use a thread adapter for this. This allows me to use a .30 caliber supressor.
This will be my first and I can use it on this rifle, my .308 and for my .223 ARs.

You are not talking about the 9mm build here, are you? 30cal = 7.62mm. they cant be used on 9mm. or did I read this wrong?

 

[Silverlode]

Edit: Never mind, I figured it out.

 

[rouchna]

Used a CMMG ramped bolt and it has a Spikes LPK. It had a Spikes Battle Trigger before the Geissele went in.

Thanks

 

[dontpanic]

You are not talking about the 9mm build here, are you? 30cal = 7.62mm. they cant be used on 9mm. or did I read this wrong?

.30cal ie 7.62 suppressors can be used on 9mm and on 5.56. You can go down from the rating of the suppressor
But not up.

AAC's .223 mount allows you to mount a .223 or .30 but thier .30 mount will not allow attachment of a .223 suppressor.

 

[dontpanic]

> 26" OAL, vertical grip is good to go. My pistol should finish out at 29.5".

Here is the ATF letter that supports this

 

[smdub]

.30cal ie 7.62 suppressors can be used on 9mm and on 5.56. You can go down from the rating of the suppressor
But not up.

But you can't go UP in bore size. 9mm > 7.62mm. A 9mm will probably physically fit through a 7.62 suppressor but you'll have baffle strikes. Not enough clearance.

Just get a 50BMG suppressor. That works w/ nearly everything

 

[TyFromMD]

.30cal ie 7.62 suppressors can be used on 9mm and on 5.56. You can go down from the rating of the suppressor

But not up.



AAC's .223 mount allows you to mount a .223 or .30 but thier .30 mount will not allow attachment of a .223 suppressor.

I was wrong ....

 

[clandestine]

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.

 

[TyFromMD]

Wow... That's tight huh. I was wrong.

 

[clandestine]

Wow... That's tight huh. I was wrong.

The YHM Wraith Q.D. 9mm mount is the specific mount. If its modified it will allow a YHM .308 Q.D. Phantom to mount up. The bore will clear on the ones I have worked with, but the threads on the barrel have to be PERFECT.

 

[Wayne1one]

I was hoping you would chime in Your builds are always top notch.
Thanks for posting the videos as well.

It was my pleasure, can't wait to see the finished product!!!

 

[aaronn]

I'm jealous that you don't have the OAL issue to contend with. My 9mm AR is at an IP right now having the barrel chopped and threaded. I had to go with a 9.5" barrel, but I should still be able to throw 147gr ammo through it suppressed and still have it subsonic.

I'm going with a 7" handguard though. Just personal preference for me.

 

[rouchna]

I'm jealous that you don't have the OAL issue to contend with. My 9mm AR is at an IP right now having the barrel chopped and threaded. I had to go with a 9.5" barrel, but I should still be able to throw 147gr ammo through it suppressed and still have it subsonic.

I'm going with a 7" handguard though. Just personal preference for me.

Nice! Be sure to post pics when it's done.

 

[rouchna]

I have another question.

What buffer are you guys using on these? Are you using one made for the 9mm bolt or are you using a standard heavy buffer + Spacer?

Thanks.

 

[clandestine]

I have another question.

What buffer are you guys using on these? Are you using one made for the 9mm bolt or are you using a standard heavy buffer + Spacer?

Thanks.

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

 

[Speed3]

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

This is why I want to build a 9mm ar! I will have to go the pistol route but thus is pure sex!

 

[teratos]

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