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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 08-08-2018, 12:43 PM
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Default Reliable AR-15 conversion to 9mm?

How does one convert an AR-15 to a 9mm?

What parts need to be changed?

What are some of the most reliable conversion kits and parts you would recommend? (Prefer Glock Mags and Last round bolt hold open.)
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  #2  
Old 08-08-2018, 12:59 PM
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Depends what mag you use, I used Colt mags for mine. I used a Hahn drop-in block, 9mm buffer, special buffer spacer. Some conversions require a special bolt stop. And of course a 9mm upper or barrel and bolt carrier assembly.
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Old 08-08-2018, 1:28 PM
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It sure about “conversion kits” for 9mm AR.

As stated above...assuming you have a standard AR-15 type lower receiver...you will need a mag block for either Glock or Colt pattern mags.
A complete 9mm upper....or role your own.

A 9mm buffer set up.

If you have a milspec trigger, then you are probably GTG there. If you have a aftermarket trigger, some work with 9mm builds some do not.

.
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It makes it bigger and longer.
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Old 08-08-2018, 1:40 PM
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Here's a glock mag adaptor for your 5.56 lower, pricey but good reviews

https://www.brownells.com/rifle-part...rod117289.aspx

PSA has a complete 16" 9mm upper on clearance ($249)

https://palmettostatearmory.com/psa-...165448580.html
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Old 08-08-2018, 2:05 PM
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Quote:
Originally Posted by M76 View Post
Here's a glock mag adaptor for your 5.56 lower, pricey but good reviews

https://www.brownells.com/rifle-part...rod117289.aspx

PSA has a complete 16" 9mm upper on clearance ($249)

https://palmettostatearmory.com/psa-...165448580.html
You know this combo works? You run one? I heard PSA uppers don't work with it. If they do, that would be great. I'd be willing to pay another $200 for a Stern upper that was guaranteed to work, YMMV.
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Old 08-08-2018, 3:45 PM
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Just be aware that Colt mag setups have a higher ejector than a Glock mag setup. Some bolts will clash with Colt mag setups.
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Old 08-08-2018, 3:49 PM
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I have a rock river arms complete upper. Hahn drop in conversion block, rock river arms 9mm buffer (5.6oz same as an H3 buffer, just .3 heavier) standard AR buffer spring, and made my own spacer for the buffer tube out of a $1 wooden dowel from home depot. Uses colt pattern mags. Runs awesome.

I originally took the advice from everyone and got an extra power buffer spring (way too stiff) and a slash Q-9mm heavy buffer (way too heavy) couldn't get past 1 round without a major jam. Took it all out and used the AR buffer spring and the AR h3 buffer weight and ran flawless.
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Old 08-08-2018, 3:52 PM
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https://www.meanarms.com

Endo mag. Hopefully this and a cheap PSA 9mm upper will be reliable.
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Old 08-08-2018, 8:53 PM
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Originally Posted by NATEWA View Post
https://www.meanarms.com

Endo mag. Hopefully this and a cheap PSA 9mm upper will be reliable.
Beat me to it. Iím just waiting on them now. I hope itís a runner I think it will be fun.
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Old 08-08-2018, 9:07 PM
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Originally Posted by NATEWA View Post
https://www.meanarms.com
Endo mag. Hopefully this and a cheap PSA 9mm upper will be reliable.
Nice! Will this work with 10-rd pmags? The pic looks like
a 10/30, don't the high cap bodies have to be riveted?
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Old 08-08-2018, 9:14 PM
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Originally Posted by M76 View Post
Nice! Will this work with 10-rd pmags? The pic looks like
a 10/30, don't the high cap bodies have to be riveted?
Thereís another thread going about that. Iím of the opinion it would not if it could only hold ten rounds. But others may disagree. Another poster claimed there is a 10 rd body version in the works. I hope heís right cause I hate 30 rd bodies honestly. It would be different if we could use them as intended. We will see.
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Old 08-08-2018, 9:35 PM
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Quote:
Originally Posted by crufflers View Post
You know this combo works? You run one? I heard PSA uppers don't work with it. If they do, that would be great. I'd be willing to pay another $200 for a Stern upper that was guaranteed to work, YMMV.
I don't know, just wishful posting on my part...

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Originally Posted by Bullets&Whitewalls View Post
There’s another thread going about that. I’m of the opinion it would not if it could only hold ten rounds. But others may disagree. Another poster claimed there is a 10 rd body version in the works. I hope he’s right cause I hate 30 rd bodies honestly. It would be different if we could use them as intended. We will see.
Thanks for the info, a $24.99 mag insert beats the hell out of a $179.99 adaptor
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Old 08-09-2018, 7:02 AM
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Originally Posted by Bullets&Whitewalls View Post
....I hope heís right cause I hate 30 rd bodies honestly. It would be different if we could use them as intended. We will see.
The 32 round Colt mag really hangs low and you can't use it on the bench unless you go all gangster and tilt the whole gun. The 10s and 20s are very practical.
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Old 08-09-2018, 7:09 AM
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I too prefer colt mags. I bought a complete PSA rifle kit and have shot it a whole bunch with no failures. Too much fun!
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Old 08-09-2018, 10:23 AM
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There is another very long and detailed thread about AR 9mm carbines on this forum that is worth reading...seems there are a lot of AR 9mm carbine fans.

Not an expert, but my short list of possible parts you need or may need in a nutshell for converting a 5.56 AR lower to a reliable 9mm rifle. The list of parts includes items that you may need if you have problems with your conversion or wear, tear and breakage. I am assuming your AR-15 is a carbine.

1). A 9 mm upper, with a 9mm bolt
2). A magazine well adapter that allows 9mm magazines. The ejector is built into the magazine well adapter
3). 9mm magazines
4). possibly a 9mm hammer, you may have problems with a standard AR 15 notched hammer unless your 9mm bolt is ramped.
5). Possibly, a 9mm bolt catch (some manufacturers have bolt catches specifically for their AR 9mm carbines).
6). A heavier buffer, 5 oz at least
7) Possibly a stronger action spring like Wolff Extra Power buffer spring
8). Buffer spacer, quarters or a longer buffer (I use a Spikes Tactical buffer spacer in my AR 9).
9). Stainless steel hammer and trigger pins, some say the 9mm is harder on the standard hammer roll pin and also hard on the receiver roll pin holes.

Items 6, 7, 8 are things related to keeping your rifle cycling without doing things like breaking the rifle's bolt catch.

With all this stuff, consider getting a ready made dedicated 9mm lower if you are going to shoot AR 9mm a lot. That will eliminate the need for most of the list of items and perhaps reduce any issues getting everything to work reliably.

Last edited by loademup; 08-09-2018 at 7:39 PM..
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Old 08-09-2018, 2:07 PM
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Quote:
Originally Posted by russ69 View Post
The 32 round Colt mag really hangs low and you can't use it on the bench unless you go all gangster and tilt the whole gun. The 10s and 20s are very practical.
I agree. I am really hoping for the 10 rd adapter from meanarms. More than likely I will be shooting from the bench as I do with most of my rifles.
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Old 08-09-2018, 2:22 PM
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Bench shooting a 9mm Carbine?



.
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It makes it bigger and longer.
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Old 08-09-2018, 2:31 PM
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I built one last year that takes Glock mags but it doesn't have a LRBHO. I bought a matched receiver set from Gibbz Arms (G9 side charging upper and matching lower) and it's great. I believe they are going to change the upper design in the near future to get LRBHO capability.

Basically, I used the Gibbz Arms receiver set, JP Enterprises 9mm enhanced bolt and buffer, a Rosco bloodline 9mm 14.5" barrel with a MB pinned and welded, with a Geissele SSA trigger. It has run flawlessly so far everytime I have brought it out. Super fun.
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Old 08-09-2018, 7:57 PM
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Originally Posted by BigBamBoo View Post
Bench shooting a 9mm Carbine?



.
Where I shoot is free range but can get very busy. I usually set all my stuff out and stay in one spot. Thatís all. I like to sit I have a messed up back.
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Old 08-10-2018, 1:44 AM
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Quote:
Originally Posted by Spyder View Post
I too prefer colt mags. I bought a complete PSA rifle kit and have shot it a whole bunch with no failures. Too much fun!
Just curious which magazines are you using? I have the same setup and I use asc mags. Asc mags don't work for me.
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  #21  
Old 08-10-2018, 5:50 AM
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Others have provided good info on "conversion" idea

But think of this, with the present price point of the lower receivers, it maybe cheaper and more reliable to buy the dedicated 9mm lowers. Only thing you are really saving is the complete lower less the buffer. With the conversion, you need to worry about if this setup works with that, blah, blah... By the time you are done with conversion, you are just South of $200 for the lower, which is about how much a dedicated complete 9mm will run you (or less)

Conversion only makes sense if somehow you want to keep the lower, ie RAW, so you can enjoy other functionalities.
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Old 08-10-2018, 6:52 AM
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Pardon my ignorance on this, but can we still buy stripped 9mm lowers in CA? The prices seem about the same for a stripped lower, as most of the mag well adaptors.
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Old 08-10-2018, 8:01 AM
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Quote:
Originally Posted by BigBamBoo View Post
Bench shooting a 9mm Carbine?



.
I see lots of people bench shooting .22 LR carbines. Should I tell them to stand up and use a red dot? Or just let them enjoy the range session
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Old 08-10-2018, 9:22 AM
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Here Ya Go.....Everything you ever Wanted and Didn't want to know about a 9mm Conversion. http://www.calguns.net/calgunforum/s....php?t=1098494
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Old 08-10-2018, 9:38 AM
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Quote:
Originally Posted by crufflers View Post
I see lots of people bench shooting .22 LR carbines. Should I tell them to stand up and use a red dot? Or just let them enjoy the range session
Each to their own...static shooting would put me to sleep.

.
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Originally Posted by ar15barrels View Post
It makes it bigger and longer.
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Old 08-10-2018, 10:21 AM
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Each to their own...static shooting would put me to sleep.

.
Same for me but not everyone has a place that allows more dynamic stuff nor do some people enjoy it.
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Old 08-10-2018, 10:49 AM
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Totally agree...I was not downing on anyone’s choice of shooting. In fact that is the number one GREAT thing about guns...

There is something for just about anyone when it comes to shooting. There are folks who just like to collect guns and never shoot them. To folks who compete in one or many shooting sports.

If you are having fun with a gun....then you are doing it right.


.
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It makes it bigger and longer.
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Old 08-10-2018, 3:14 PM
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Quote:
Originally Posted by M76 View Post
I don't know, just wishful posting on my part...



Thanks for the info, a $24.99 mag insert beats the hell out of a $179.99 adaptor
You can get one from Kak industry for $100. Works as well as my PSA one but this is top load. They sometimes have sales during major holidays.
https://www.kakindustry.com/ar-15-pa...mm-mag-adaptor

I saw one from Sylvan arms at Primary Arms for $60 but its no longer on their site. I dont own one of these
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Old 08-10-2018, 3:22 PM
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Quote:
Originally Posted by roguedogue View Post
You can get one from Kak industry for $100. Works as well as my PSA one but this is top load. They sometimes have sales during major holidays.
https://www.kakindustry.com/ar-15-pa...mm-mag-adaptor

I saw one from Sylvan arms at Primary Arms for $60 but its no longer on their site. I dont own one of these
The web page says "bottom load" and it comes with a working last-round hold open like the $200 Hahn Precision block. Looks good.

I'd be curious whether it required ASC followers to be filed a hair to clear the feed ramp.

Last edited by Drew Eckhardt; 08-10-2018 at 3:27 PM..
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Old 08-10-2018, 3:38 PM
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Honestly just buy a Ruger PC9
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Old 08-10-2018, 8:51 PM
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Quote:
Originally Posted by Drew Eckhardt View Post
The web page says "bottom load" and it comes with a working last-round hold open like the $200 Hahn Precision block. Looks good.

I'd be curious whether it required ASC followers to be filed a hair to clear the feed ramp.
I only had to buff off the "Powder Coat" on the Feed Lips on mine to make them feed reliably.
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  #32  
Old 08-11-2018, 6:41 AM
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I have a Hahn top load that retains the bolt hold open feature. If I did it again I think I'd just get the bottom load version and just forget the BHO being that the bolt catch is a weak point on the 9mm guns.
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Old 08-11-2018, 7:53 AM
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Quote:
Originally Posted by russ69 View Post
I have a Hahn top load that retains the bolt hold open feature. If I did it again I think I'd just get the bottom load version and just forget the BHO being that the bolt catch is a weak point on the 9mm guns.
The bottom loading Hahn magazine adapter retains BHO on colt pattern magazines, The possibility of bolt catch breakage is eliminated by limiting bolt travel to 1/8th inch beyond bolt catch.
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Old 08-11-2018, 8:27 AM
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Take a look at the Olympic arms 9mm upper. Slap it on and use their mags. Super easy
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Old 08-11-2018, 2:21 PM
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Quote:
Originally Posted by spfabrication View Post
The bottom loading Hahn magazine adapter retains BHO on colt pattern magazines, The possibility of bolt catch breakage is eliminated by limiting bolt travel to 1/8th inch beyond bolt catch.
...and stronger pins, and the right buffer, and....
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Old 08-11-2018, 5:21 PM
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Quote:
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...and stronger pins, and the right buffer, and....
I have never had a bolt catch , trigger/hammer pin break. If you set the gun up correctly , they are very reliable. I have put all mine through the wringer and they still work great from 165gr subsonic suppressed to 115gr dirty wolf steel case.
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Old 08-12-2018, 8:37 AM
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I have a PSA kit which I installed on a 80% receiver I made. It's been boringly reliable. Just works every time with whatever ammo I use. Cheap white box or +P+ hollow points just keeps shooting.













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Old 08-12-2018, 9:00 PM
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I did break a "Trigger Pin", once. But that was right after I first built the gun. It may have been a faulty one, as it broke right in the middle like it was cut with a knife. toddh Suggested a Buffer Spacer change and I have had no further problem. I even bought additional trigger pins and a set of KNS Trigger Pins, but you know how that works.
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Old 08-25-2018, 1:44 PM
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The other day, I finally got to use simunition rounds (essentially paintball bullets in a 9x19mm package) during a military reserve training exercise (up until now, I'd only used DISE gear -- that's MILES gear to you older veterans).

The thing is, we used the same lowers from our M4 service rifles -- we just swapped out the uppers. Didn't even need a magwell block either because of these special magazines that had the same footprint as your standard USGI mags:


So...is there anyone who makes such a simple 9mm conversion kit? None of this messing around with mag blocks and buffer springs and the what-not -- just swap out the upper and use special mags?

I'm guessing not, otherwise why would folks get dedicated 9mm lowers?
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Old 08-25-2018, 2:08 PM
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This needs no block. But you would still need a heavier buffer than a standard 5.56 buffer. Because 9mm is blowback not gas.
https://www.meanarms.com/products/de...g-9mm-preorder
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