AR-15 9mm conversion

ajviera · Jan 2, 2018

Bought Stern Defense parts (Mag adaptor, BCG, 16" Barrel & muzzle device) to convert one of my AR-15's into a 9mm.

jimbobborg · Jan 2, 2018

Looks good.

Neutron · Jan 2, 2018

Heavy buffer?

ar15dave · Jan 2, 2018

Does that take Glock mags?

Dave

erwos · Jan 2, 2018

ar15dave said:
Does that take Glock mags?

Apparently so:
https://getstern.com/products/mag-ad9

You can tell there's some substantial engineering involved to make it happen, but it looks good. Some people are gonna hate the bottom mag release, but that's not the worst price you could ever pay. Makes me wonder if this block is compatible with the CMMG MkG radial blowback BCG.

ar15dave · Jan 2, 2018

I use a Hahn Magwell block. They have three models. I use the drop in version. Easy to change back and forth. Not really worried about last round hold open feature. Uses Colt style mags. Works well.

Was curious how well this one worked. Have to wait until I get home to see the manufacturer website.

Dave

44man · Jan 2, 2018

So a 9 mm at doesn’t use a gas block and gas tube?

erwos · Jan 2, 2018

NeutronBlu said:
Heavy buffer?

OP, pay attention to this comment. You do not want to be running a normal carbine buffer in a 9mm direct blowback gun, unless you like broken bolt catches.

ar15dave said:
I use a Hahn Magwell block. They have three models. I use the drop in version. Easy to change back and forth. Not really worried about last round hold open feature. Uses Colt style mags. Works well.

You're preaching to the choir, I run real-deal Uzi mags with a VMH adapter and also use a Glock-mag lower. I can just see how some people would not mind this kind of option, especially if they wanted to run Glock mags in their RR M16 or something.

Apparently another company has also come out with a Glock magwell, too:
https://sylvanarms.com/product/sylvan-arms-9mm-glock-conversion-block/

44man said:
So a 9 mm at doesn’t use a gas block and gas tube?

No gas tube or block required. Unless it's an MPX (piston) or CMMG MkG (radial delayed blowback), it's direct blowback.

Magnumite · Jan 2, 2018

So do the direct blowback conversions use the standard carbine spring?

ajviera · Jan 2, 2018

erwos said:
OP, pay attention to this comment. You do not want to be running a normal carbine buffer in a 9mm direct blowback gun, unless you like broken bolt catches.

The Military Arms Channel did a review and ran a standard spring & buffer without issues and even ran it supressed. https://www.youtube.com/watch?v=siavaA2mWms&t=929s

ajviera · Jan 2, 2018

ar15dave said:
Does that take Glock mags?

Dave

Yes and they are working on an adaptor to use S&W mags

ajviera · Jan 2, 2018

ar15dave said:
I use a Hahn Magwell block. They have three models. I use the drop in version. Easy to change back and forth. Not really worried about last round hold open feature. Uses Colt style mags. Works well.

Was curious how well this one worked. Have to wait until I get home to see the manufacturer website.

Dave

Checkout this review. https://www.youtube.com/watch?v=siavaA2mWms&t=929s

teratos · Jan 2, 2018

ajviera said:
The Military Arms Channel did a review and ran a standard spring & buffer without issues and even ran it supressed. https://www.youtube.com/watch?v=siavaA2mWms&t=929s

I would run a heavy buffer. The advice is free.

erwos · Jan 2, 2018

ajviera said:
The Military Arms Channel did a review and ran a standard spring & buffer without issues and even ran it supressed. https://www.youtube.com/watch?v=siavaA2mWms&t=929s

It's your BHO. Maybe you've got an extra strong one, or maybe MAC did... but there's a long, long history of busting them when not using heavier/longer buffers. Besides, they dampen recoil, too.

ajviera · Jan 2, 2018

teratos said:
I would run a heavy buffer. The advice is free.

erwos said:
It's your BHO. Maybe you've got an extra strong one, or maybe MAC did... but there's a long, long history of busting them when not using heavier/longer buffers. Besides, they dampen recoil, too.

Ordered a H3 buffer just to be safe. Thanks guys

Melnic · Jan 2, 2018

ajviera said:
Bought Stern Defense parts (Mag adaptor, BCG, 16" Barrel & muzzle device) to convert one of my AR-15's into a 9mm.

cool,
Post links and cost if you would

ironpony · Jan 2, 2018

Thanks for this thread OP. and the info guys. I'm seeing more and more about the rise of the 9mmar and some even say it may catch the 300 bo in civilian and military use ???

ajviera · Jan 2, 2018

Melnic said:
cool,
Post links and cost if you would

https://getstern.com/pages/products

teratos · Jan 2, 2018

erwos said:
Apparently so:
https://getstern.com/products/mag-ad9

You can tell there's some substantial engineering involved to make it happen, but it looks good. Some people are gonna hate the bottom mag release, but that's not the worst price you could ever pay. Makes me wonder if this block is compatible with the CMMG MkG radial blowback BCG.

Very little information out there on the compatibility of the CMMG MkG with anything. My bolt/barrel should be in today. I can shed some light on whether it will work with a Colt pattern lower.

clandestine · Jan 2, 2018

ironpony said:
Thanks for this thread OP. and the info guys. I'm seeing more and more about the rise of the 9mmar and some even say it may catch the 300 bo in civilian and military use ???

If the gun is for practical use then 9mm AR's do have a niche.

For under 7" 9mm is a great AR Platform. Longer than 7" barrel is dumb IMO.

For 8"-10" the .300 BLK shines. It has a better B.C. than 9mm for shots outside pistol caliber range.

For 11.5"+ the 5.56 does just fine, but does better with longer barrels (faster velocity)

AR-15 9mm conversion

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