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Old 05-05-2019, 08:22 AM
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Default 9mm AR Build



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Picked up a couple of lowers yesterday a PSA and thinking about building a couple of 9mm AR's.

To those who have built these before: Any pitfalls or issues you have encountered?

Who has parts I need to stay away from?

My current plan is to build a Colt style 9mm AR but with a flat top upper.

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Old 05-05-2019, 02:19 PM
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I built a PSA 9mm with Colt style magazines and it works like a champ. Not one hiccup since 2015.



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Old 05-05-2019, 03:45 PM
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I like that. A lot. What kind of mag well insert did you use?

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Old 05-06-2019, 01:00 PM
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The one that PSA sold with the kit. It has no name on it but, I assume it is a PSA all metal adapter.

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Old 05-08-2019, 09:47 PM
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Built mine on an Anderson lower, ar15part.com upper, cmmg bolt, kak received block and psa lpk. Runs flawless. Great pistol.

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Old 05-08-2019, 10:07 PM
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I don't have a 9mm AR, and I want one.
I do have Glocks, and plenty of 33rd mags, but... I REALLY like the way the Colt mags look. Silly I know, but it's sexy. The cant on the Glock mags doesn't look as cool.

Pretty shallow in many ways, but at this point if I'm going to add a sixth caliber to my AR's who am I kidding? It's about 'want' rather than 'necessity.'

Good looking AR's guys.
Would love something like an M3 Greasegun (I know they're 45ACP) in 9mm.
So many guns, so little gun budget....
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Old 05-09-2019, 07:38 PM
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crank up the press for 9mm
like I said, its as much or more fun like 22lr, just much more expensive!!!
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Old 05-14-2019, 06:55 AM
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I’ve got two Colt 9mm Carbines (AR 6450 & AR6951). The barrels don’t heat up like they do on a 5.56mm AR. Honestly, shooting a 9mm AR is the most fun you can have with your clothes on...
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Old 05-20-2019, 01:45 PM
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Quote:
Originally Posted by Chili View Post
Picked up a couple of lowers yesterday a PSA and thinking about building a couple of 9mm AR's.

To those who have built these before: Any pitfalls or issues you have encountered?

Who has parts I need to stay away from?

My current plan is to build a Colt style 9mm AR but with a flat top upper.

Sent from my SM-G955U using Tapatalk
If you handload, make sure to not over-pressure loads for 16" barrels. When I started handloading I ended up with 2 case head separations and a broken extractor because my loads were a bit too hot. Now I stick with middle of the road loads, strictly with 124gr bullets. I also read in Speer's reloading book Volume 14 (I believe) that 147gr bullets can pose a risk in barrels over 10" due to not moving as fast as lighter bullets; adding potential for a stuck bullet. While I have shot factory 147gr 9mm through my PSA carbine, I've avoided it since learning that.
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Old 05-20-2019, 01:52 PM
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Quote:
Originally Posted by strokes762 View Post
If you handload, make sure to not over-pressure loads for 16" barrels. When I started handloading I ended up with 2 case head separations and a broken extractor because my loads were a bit too hot. Now I stick with middle of the road loads, strictly with 124gr bullets. I also read in Speer's reloading book Volume 14 (I believe) that 147gr bullets can pose a risk in barrels over 10" due to not moving as fast as lighter bullets; adding potential for a stuck bullet. While I have shot factory 147gr 9mm through my PSA carbine, I've avoided it since learning that.
Good info, thanks. I never load max, just try to keep things at factory specs

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Old 05-21-2019, 01:36 AM
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Quote:
Originally Posted by strokes762 View Post
If you handload, make sure to not over-pressure loads for 16" barrels. When I started handloading I ended up with 2 case head separations and a broken extractor because my loads were a bit too hot. Now I stick with middle of the road loads, strictly with 124gr bullets. I also read in Speer's reloading book Volume 14 (I believe) that 147gr bullets can pose a risk in barrels over 10" due to not moving as fast as lighter bullets; adding potential for a stuck bullet. While I have shot factory 147gr 9mm through my PSA carbine, I've avoided it since learning that.
I've watched many thousands of factory 147 grain 9mm go downrange through 16" barrels, never an issue.
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Old 06-04-2019, 09:32 AM
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Quote:
Originally Posted by strokes762 View Post
If you handload, make sure to not over-pressure loads for 16" barrels. When I started handloading I ended up with 2 case head separations and a broken extractor because my loads were a bit too hot. Now I stick with middle of the road loads, strictly with 124gr bullets. I also read in Speer's reloading book Volume 14 (I believe) that 147gr bullets can pose a risk in barrels over 10" due to not moving as fast as lighter bullets; adding potential for a stuck bullet. While I have shot factory 147gr 9mm through my PSA carbine, I've avoided it since learning that.
if you look at Ballistics By The Inch you notice a trend with pistol caliber carbines in 9mm, 40S&W, and 10mm

namely, that the lighter bullets perform better in terms of energy and velocity gain, and overall energy at 16 inches

it seems counterintuitive. in 9mm the 90gr performed best, the 147gr worst, across different manufacturers. it seems to bear our across all auto-calibers.
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Old 06-04-2019, 11:23 AM
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Quote:
REALLY like the way the Colt mags look. Silly I know, but it's sexy. The cant on the Glock mags doesn't look as cool.
Good, thought it was just me that can't get enough of the Colt mags for that very reason . I made mine take inspiration from an MP5A5 a bit.



I built mine, QC10 blem lower + blem VLTOR upper, 7.5" heavy barrel and QC10 handguard that fits the VLTOR. Everything on it I bought on sale in some fashion (except the LPK, normal price. Maxim brace was also on sale. It's my favorite AR to shoot.

My word of caution is that unless you're building one with a 16" barrel, you're going to hear a lot of people saying run very heavy buffers like the Spike's ST-9X. Maybe this is unique to me, but if I bump fire this thing that Spike's buffer just wasn't moving fast enough and wound up with an OOB primer strike . That was exciting. Granted it was subsonic ammo, but I'll happily accept a smidge more recoil and ensure that bolt is moving quick enough, but not fast enough to get the "port bark" to happen. The 115's will run like crazy now .



My "winning formula" for my 7.5" barrel is a 9mm bolt (16oz one, I'm using a CMMG 9mm bolt), a Geissele Super 42 spring + H1 buffer (they sell them together as aunit) and 7 flat washers in the bottom of the tube (to speed up the cycle and prolong bolt catch life)- this was when I was using a standard tube and the SBa3 brace. The Maxim PCB buffer also works very well so far, and needs no washers (it actually shortened the stroke even further by about 3/32"). Harder to bump since it's even shorter now, but hopefully I've gotten that out of my system.

Quote:
crank up the press for 9mm
Ain't that the truth! Haha!

Latest thing is waiting for a Silencerco Hybrid and a 3-lug mount for it. It is VERY quiet when using my friend's Hybrid.
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Old 06-08-2019, 07:31 PM
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Quote:
Originally Posted by MagnumWill View Post
My "winning formula" for my 7.5" barrel is a 9mm bolt (16oz one, I'm using a CMMG 9mm bolt), a Geissele Super 42 spring + H1 buffer (they sell them together as aunit) and 7 flat washers in the bottom of the tube (to speed up the cycle and prolong bolt catch life)- this was when I was using a standard tube and the SBa3 brace.
Posting just so I can come back and find this some day. I've had a 9mm stripped lower in the safe for over a year now.

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Old 06-09-2019, 07:54 AM
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^^^ You’ve got the most important part already...
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Old 06-11-2019, 02:57 AM
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Quote:
Originally Posted by HappyinID View Post
I've watched many thousands of factory 147 grain 9mm go downrange through 16" barrels, never an issue.
That's fine and dandy, I've had the same results. But when it comes to handloading most books will go a little below factory loads. Just to cover themselves in case their data causes either a squib or an excessive load, they say 147gr 9x19mm may cause issues.

Quote:
variation in locking mechanisms and spring rates in 9mm... may exhibit sluggish function with the slower of 147 grain loads.
-Speer Vol. 13 Page 503
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Old 07-29-2019, 06:20 PM
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Quote:
Originally Posted by sarco2000 View Post
Posting just so I can come back and find this some day. I've had a 9mm stripped lower in the safe for over a year now.



.
I haven't had my stuff that long, but it feels like it.

So far I have the lowers and the parts to go in them. Bought bolts and charging handles too.

What mag block should I get? Looking to use stick mags. Thought about using endo mags, but want to stay with stick mags for quick recognition when noobs go shooting with me.

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Old 07-29-2019, 07:07 PM
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Quote:
Originally Posted by sarco2000 View Post
Posting just so I can come back and find this some day. I've had a 9mm stripped lower in the safe for over a year now.

.
Me too!And I'm an AK74 man!
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Old 09-14-2019, 04:52 PM
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UPDATE-- got a 16" upper from CBC industries and put it on a PSA lower. Everything mated up nicely with no issues. Used a ProMag magazine well insert and ASC 32 round stick magazines. Optic is a Vortex Spitfire 3x.

Fired 200 rounds, 100 factory 115gr Winchester and 100 125gr lead round nose reloads. Accuracy was excellent either load. Reliability was almost as good with 8 stoppages when using the Winchester factory ammo. No issues with my reloads. All 8 stoppages came towards the end of shooting session when the gun was dirty. Odd thing is my wife had 6 of the stoppages. She loves her new gun.


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Old 09-14-2019, 07:34 PM
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Just buy a kel-tec sub-2000 to match the 9mm you're carrying.
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