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Thread: 9mm AR Build Reply to Thread
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Topic Review (Newest First)
09-16-2019 09:02 AM
Chili Some crappy photos of the internals of my wife's 9mm. I think everything looks pretty good. Nothing seems abnormal.





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09-15-2019 07:28 PM
Chili
Quote:
Originally Posted by 4X4 View Post
HA! Ok, well there is that out of the way......
Agreed![emoji106]

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09-15-2019 06:28 PM
4X4
Quote:
Originally Posted by Chili View Post
Sorry, I mean they were all failure to feed. So far I am happy with the primer strikes.
HA! Ok, well there is that out of the way......
09-15-2019 03:43 PM
Chili
Quote:
Originally Posted by 4X4 View Post
Do you think that was due to the firing pin getting gummed up preventing full extension? Not all manufacturers use the same primers and seating depth. Others use harder primers etc. I'm wondering if you could do something fairly easy enough to increase the strength of the strike of the firing pin? That might help to solve a couple of issues. I'm sure you already know this and have thought about it. I'm just thinking out loud as I have a friend who built an AR and was having some issues as well.

Sorry, I mean they were all failure to feed. So far I am happy with the primer strikes.
09-15-2019 01:09 PM
Jack Swilling
Quote:
Originally Posted by OldCorps View Post
Just buy a kel-tec sub-2000 to match the 9mm you're carrying.
Just don't buy a "kel-tec sub-2000..."

FTF often caused buy not fully seating the primer
09-15-2019 12:28 PM
4X4
Quote:
Originally Posted by Chili View Post
Sorry, they were all FTF

Sent from my SM-G955U using Tapatalk
Do you think that was due to the firing pin getting gummed up preventing full extension? Not all manufacturers use the same primers and seating depth. Others use harder primers etc. I'm wondering if you could do something fairly easy enough to increase the strength of the strike of the firing pin? That might help to solve a couple of issues. I'm sure you already know this and have thought about it. I'm just thinking out loud as I have a friend who built an AR and was having some issues as well.
09-14-2019 10:00 PM
Chili
Quote:
Originally Posted by 4X4 View Post
Sounds good, thanks for the follow up. Were they a FTE or FTF? Please post up some follow up if you get different results down the road!
Sorry, they were all FTF

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09-14-2019 08:54 PM
4X4
Quote:
Originally Posted by Chili View Post
I do consider it excessive. I figured any stoppages would be from the reloads. The stoppages came towards the end of the shooting session and the gun was very dirty and getting dry as well. This was the first time out and though I have built excess of 15 ARs, this was my first 9mm build. It will get shot next weeked too so I'll post another range report.

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Sounds good, thanks for the follow up. Were they a FTE or FTF? Please post up some follow up if you get different results down the road!
09-14-2019 08:19 PM
Chili
Quote:
Originally Posted by 4X4 View Post
Not trying to be snarky but you don't consider 8 stoppages in 100 Winchester rounds excessive?
I do consider it excessive. I figured any stoppages would be from the reloads. The stoppages came towards the end of the shooting session and the gun was very dirty and getting dry as well. This was the first time out and though I have built excess of 15 ARs, this was my first 9mm build. It will get shot next weeked too so I'll post another range report.

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09-14-2019 07:10 PM
4X4 Not trying to be snarky but you don't consider 8 stoppages in 100 Winchester rounds excessive?
09-14-2019 06:34 PM
OldCorps Just buy a kel-tec sub-2000 to match the 9mm you're carrying.
09-14-2019 03:52 PM
Chili 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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07-29-2019 06:07 PM
bound for glory
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!
07-29-2019 05:20 PM
Chili
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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06-11-2019 01:57 AM
strokes762
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
06-09-2019 06:54 AM
Ozone Crusade ^^^ You’ve got the most important part already...
06-08-2019 06:31 PM
sarco2000
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.

.
06-04-2019 10:23 AM
MagnumWill
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.
06-04-2019 08:32 AM
merlinfire
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.
05-21-2019 12:36 AM
HappyinID
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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