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My AR9 build

11K views 64 replies 17 participants last post by  Brass3  
#1 · (Edited)
Everyone builds AR15s, a bunch of us build AR9s. So a 9mm AR can be a bit of a rare thing. Most people have never heard of them. But they are fun as hell.

I started with a Polymer80 receiver that I bought with a lower parts kit, and buffer tube from Ghost Firearms down in Florida. Let me say that their customer service is excellent. I ordered the pistol kit when I should have ordered the rifle. A quick email got that ironed out in less than an hour. Package arrives and it is short the lower parts kit. A quick phone call and that issue was resolved in less than 4 days. Receiver received and waiting.

Next up, I took a few more weeks looking at uppers in 9mm, all different configurations. When I totaled all the parts still needed I came up with $600. Bummer right? Nope. I stumbled upon Karrisguns.com. A new 16 inch flat top upper, with the mag conversion kit I needed, plus a 7.5 oz all stainless steel buffer. Not, Karris had gotten a ton of bad reviews, most were up to 5 years old. But I decided to take the chance, the price was right at $399 with free shipping. In 3 days I had my new complete upper with 9mm BCG. No issues, no dings, scratches or anything. Picture perfect.

OK, time to mill the 80% lower from Polymer 80. The kit was missing it end mill bit. Again, no problem, contacted Polymer 80 and I had that bit in 2 days. Let me warn all of you, the polymer 80 kit has to be done the way the company tells you. Take your time, check everything twice before you start. You will also need to fit things, so if you like to tinker this is for you. Total time start to finish was 2.5 hours.

Yay! time to fit the LPK. Disconnect spring was out of spec, and a few other parts were MIA. To the gun show! Parts in hand, the LPK was installed with antiwalk dogbone pins. This was a 5 minute procedure. No biggie.

Ok now for something called the Trokmag G-block (takes glock mags). It requires you to install it in two pieces into the magwell, a metal one, because it twisted to the side when the set screws were tightened. Well hell, I thought I was going to need to get a metal lower. Nope. I sat on it for a few hours then decided to run a drill bit down the set screw shaft, make an indent for the set screw. 20 minutes later, the G-block was installed and tweaked. Next came modification of the glock mags. The company said to only use Glock OEM mags. Pfffft, not me, I modified a magpul one as well. I had to tweak the magpul mag a bit but it works flawlessly and at 1/3 the price.

I took my new girl to the range and started pumping lead downrange. She performed flawlessly except for a few light primer strikes, The rounds were loaded back into a magazine and all fired the second go around. I will be getting another Hammer spring and this should resolve the issue. Ammo used was all ball, from 20 years old to brand new. Everything from no name reloads to Federal and Wally world Winchester white box. Again a few issues with the rounds mentioned earlier. Groups came in at around 3 inches at 50 yards. As soon as I can download the pictures I will post them up.

Sights are Dagger Defense pop up iron sights co-witnessed with on Bushnell 30mm red dot that was lying in a junk pile in my basement.

So a few hicupps along the road to building this new rifle. Oddly I never lost my temper too bad. Just a lot of hurry up and wait. Expect to take your time on a build like this. You will have to tinker and repeat. This is not for the average Joe that knows nothing about the AR platform. The ability to troubleshoot is extremely important to make a ground up build go well.

Project total: $600

EDIT: Here are the pics. We aren't allowed to have mags in during a cease fire, or when we are not at the bench, so no pic of the gun with mags yet. My shooting partner was sick today so I did the best with what I was allowed.

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#2 ·
No pics?
 
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#3 ·
9mm AR's are far from being a rare thing. Have you ever heard of PCC's? It's a Pistol Caliber Carbine. So it is usually an AR type firearm in either 9mm, 40S&W, 45ACP or 10mm(pistol caliber). USPSA and IDPA have PCC divisions in their shooting sports.
 
#4 ·
Everyone builds AR15s, a bunch of us build AR9s. So a 9mm AR can be a bit of a rare thing. Most people have never heard of them. But they are fun as hell.

I started with a Polymer80 receiver that I bought with a lower parts kit, and buffer tube from Ghost Firearms down in Florida. Let me say that their customer service is excellent. I ordered the pistol kit when I should have ordered the rifle. A quick email got that ironed out in less than an hour. Package arrives and it is short the lower parts kit. A quick phone call and that issue was resolved in less than 4 days. Receiver received and waiting.

Next up, I took a few more weeks looking at uppers in 9mm, all different configurations. When I totaled all the parts still needed I came up with $600. Bummer right? Nope. I stumbled upon Karrisguns.com. A new 16 inch flat top upper, with the mag conversion kit I needed, plus a 7.5 oz all stainless steel buffer. Not, Karris had gotten a ton of bad reviews, most were up to 5 years old. But I decided to take the chance, the price was right at $399 with free shipping. In 3 days I had my new complete upper with 9mm BCG. No issues, no dings, scratches or anything. Picture perfect.

OK, time to mill the 80% lower from Polymer 80. The kit was missing it end mill bit. Again, no problem, contacted Polymer 80 and I had that bit in 2 days. Let me warn all of you, the polymer 80 kit has to be done the way the company tells you. Take your time, check everything twice before you start. You will also need to fit things, so if you like to tinker this is for you. Total time start to finish was 2.5 hours.

Yay! time to fit the LPK. Disconnect spring was out of spec, and a few other parts were MIA. To the gun show! Parts in hand, the LPK was installed with antiwalk dogbone pins. This was a 5 minute procedure. No biggie.

Ok now for something called the Trokmag G-block (takes glock mags). It requires you to install it in two pieces into the magwell, a metal one, because it twisted to the side when the set screws were tightened. Well hell, I thought I was going to need to get a metal lower. Nope. I sat on it for a few hours then decided to run a drill bit down the set screw shaft, make an indent for the set screw. 20 minutes later, the G-block was installed and tweaked. Next came modification of the glock mags. The company said to only use Glock OEM mags. Pfffft, not me, I modified a magpul one as well. I had to tweak the magpul mag a bit but it works flawlessly and at 1/3 the price.

I took my new girl to the range and started pumping lead downrange. She performed flawlessly except for a few light primer strikes, The rounds were loaded back into a magazine and all fired the second go around. I will be getting another Hammer spring and this should resolve the issue. Ammo used was all ball, from 20 years old to brand new. Everything from no name reloads to Federal and Wally world Winchester white box. Again a few issues with the rounds mentioned earlier. Groups came in at around 3 inches at 50 yards. As soon as I can download the pictures I will post them up.

Sights are Dagger Defense pop up iron sights co-witnessed with on Bushnell 30mm red dot that was lying in a junk pile in my basement.

So a few hicupps along the road to building this new rifle. Oddly I never lost my temper too bad. Just a lot of hurry up and wait. Expect to take your time on a build like this. You will have to tinker and repeat. This is not for the average Joe that knows nothing about the AR platform. The ability to troubleshoot is extremely important to make a ground up build go well.

Project total: $600
What barrel length?
 
#22 ·
Thank you, I love the new toy.

PSA would not send the lower to Md. I got a stern no because the owner said so. Sooooo, fine I went with Polymer 80, and I have the lower cheaper than PSA. I really wanted the dedicated lower that PSA sells, plus I was going to order the upper from them as well. But nope. Which is fine, I will give my money to those that will sell.
 
#13 ·
I was looking at Circle 10 parts. From what I understand they made the best lower that uses Glock mags. After I saw the price I put it off for now. I fired one that was made with a standard AR lower and used a adaptor to use Glock mags and it sucked.
 
#14 ·
#16 ·
"So a 9mm AR can be a bit of a rare thing." and "...fun as hell." Really? Hardly.
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I've built two 9mm AR's...the first being the pistol shown above, and the other a carbine. It was so exciting to shoot that I sold it after only 1 range session. Even though it looked cool and functioned well, this bland experience caused me to realize that any large platform pistol chambered in 9mm would be a complete bore, and considering how much more boring a carbine chambered in 9mm would be, I sold the Colt SMG mag lower carbine that I built to compliment the pistol without even firing a single round through it.

This revelation caused me to decide that if I were to ever build or own such a large platform pistol that it would be chambered in a rifle caliber. My Zastava M92 and CZ 805 BREN S1 shown below fit the bill very nicely...both are very easy to shoot, are surprisingly accurate, with both firing common ammunition and utilizing common mags, while putting out hellascious fireballs and concussion waves :D
Image

Comparitively speaking, the 9mm AR pistol was a peashooter. Interestingly, the AR 9 pistol was intitially appealing to me - until I fired mine, though I will admit that it was at least an interesting and rewarding experience investigating, deciding on, accumulating, and assembling the necessary parts for the builds.

YMMV.
 
#20 ·
I have target photos. Gun photos will be at the range Wednesday because of geo-tagging with my phone. I don't like people knowing where I live. The targets were at 50 yards, Iron sights because I neglected my red dot battery. Wednesday the gun pics will be in :)

PCCs are rare in Maryland since most retailers of those lowers will not ship to Maryland. PCCs are a niche weapon, not as popular as 5.56. When I was refused at several retailers namely Palmetto, I said screw them I am building one with a 80% poly lower. The upper is great, high quality and it fits the lower so tightly that there is no movement. Granted it will loosen up over time, but hey, I have my rifle.

View media item 9363View media item 9362
 
#23 ·
Thank you, I love the new toy.

PSA would not send the lower to Md. I got a stern no because the owner said so. Sooooo, fine I went with Polymer 80, and I have the lower cheaper than PSA. I really wanted the dedicated lower that PSA sells, plus I was going to order the upper from them as well. But nope. Which is fine, I will give my money to those that will sell.
Can you get ammo in MD. .....sounds like California?
 
#30 · (Edited)
I have tried to do just that. And I cannot for the life of me find that feature to turn it off. Suggestions? Because while I can build and work on computers, me and posting photos anywhere on the net is an issue for me.:help::devildance::couch:
This is no joke. I visited the thread from my phone with out logging in and I could see the pics myself, and that is WITHOUT me logging in. I was just a normal visitor.
 
#32 ·
I had to re read the opening tread after seeing that hot blonde then skip to page two .

Ok , MY wife wanted a 9mm AR and I was building a 223 wylde version so ordered an extra upper and lower from aero precision that were blems , a GM 10.5" 9mm barrel a 3" flash bloop tube to keep blast away from shooter or people next to you and managed to find a 9mm bolt at a gun show that runs with normal trigger groups . I forgot some parts names as its been a some years but the good aluminum 9mm conversion block at the time was back ordered everywhere it seemed so decide to use the Promag version and darn thing has worked great for years . I used a standard pistol length tube and a sig brace on it and tried a JMT trigger for mine in it and it ran well so ordered another one for mine and my wifes has a nice 3 lb 9oz drop in trigger . Added a RRA used free float tube and a primary arms "better " 2moa dot optic . We have a small pile of 20 and 30 round mags and is one fun "pistol" and more than accurate enough with a red dot and it can be shoulder fired again . MY wife added a green lazer and a light .
 
#33 ·
Why didn't you just get a dedicated 9mm lower built that is glock mag ready? Brownell's has the bolt cheaper than PSA. In fact PSA has the complete lower assembly if you wanted it.
 
#37 ·
Brass3 Did not want a 9mm only lower only as cost was higher at the time and what if a 5.56 or 300 blackout upper was to be used ?? Only a 3 or 4minute swap and my trigger groups with both Bet you did not think of that !! Glock lower !! ?? I only have one glock as it is and just bought . I a bit more old school that most around here and would rather use METAL mags for the same reason I rather use metal mags in my AR15 . I picked up a 9mm bolt at even lower cost at a gun show than eny where else new that would work with a standard AR trigger . Pay more attention as the AR9 was built some years back , not recently .
 
#38 ·
Brass3 Did not want a 9mm only lower only as cost was higher at the time and what if a 5.56 or 300 blackout upper was to be used ?? Only a 3 or 4minute swap and my trigger groups with both Bet you did not think of that !! Glock lower !! ?? I only have one glock as it is and just bought . I a bit more old school that most around here and would rather use METAL mags for the same reason I rather use metal mags in my AR15 . I picked up a 9mm bolt at even lower cost at a gun show than eny where else new that would work with a standard AR trigger . Pay more attention as the AR9 was built some years back , not recently .
OH, I see now my mistake sorry for the misunderstanding, no harm meant by any means.
 
#39 ·
I just shot my recently completed AR-9 today, and really like it. The lower is a Critical Capabilities/Glock mag type. I just bought a 16" M-lok rifle upper from PSA on clearance for $250 shipped. I put a Bushnell AR something or other red dot on it. It shoots very nicely - smooth with the 8 oz buffer. Accurate too. With my mild reloads of 115gr FMJ over 231, it was printing one inch groups at 25 yards rested. It's not hard to keep shots in a 3" bullseye when shooting offhand. I'll soon be starting load development with Blue Dot, and other powders, to maximize the energy and accuracy. No pics since Photo Bucket stopped working on sites like GT. I need to find another image hosting site...
 
#40 ·
Congrats on the new 9. You'll like it a lot. I recently finished my 4.5" and I like it so much, more than I thought I would. I'm using a 308 spring w/ a SS-7.5 oz buffer no felt recoil at all w/ no rise. I'm using reloads as well.
I got this pic. link from the Tech Forum and love it. now and then a box comes up to enter a code word (pain) simply type in what they tell yah.
http://tinypic.com/
 
#43 ·
Everyone builds AR15s, a bunch of us build AR9s. So a 9mm AR can be a bit of a rare thing. Most people have never heard of them. But they are fun as hell.

I started with a Polymer80 receiver that I bought with a lower parts kit, and buffer tube from Ghost Firearms down in Florida. Let me say that their customer service is excellent. I ordered the pistol kit when I should have ordered the rifle. A quick email got that ironed out in less than an hour. Package arrives and it is short the lower parts kit. A quick phone call and that issue was resolved in less than 4 days. Receiver received and waiting.

Next up, I took a few more weeks looking at uppers in 9mm, all different configurations. When I totaled all the parts still needed I came up with $600. Bummer right? Nope. I stumbled upon Karrisguns.com. A new 16 inch flat top upper, with the mag conversion kit I needed, plus a 7.5 oz all stainless steel buffer. Not, Karris had gotten a ton of bad reviews, most were up to 5 years old. But I decided to take the chance, the price was right at $399 with free shipping. In 3 days I had my new complete upper with 9mm BCG. No issues, no dings, scratches or anything. Picture perfect.

OK, time to mill the 80% lower from Polymer 80. The kit was missing it end mill bit. Again, no problem, contacted Polymer 80 and I had that bit in 2 days. Let me warn all of you, the polymer 80 kit has to be done the way the company tells you. Take your time, check everything twice before you start. You will also need to fit things, so if you like to tinker this is for you. Total time start to finish was 2.5 hours.

Yay! time to fit the LPK. Disconnect spring was out of spec, and a few other parts were MIA. To the gun show! Parts in hand, the LPK was installed with antiwalk dogbone pins. This was a 5 minute procedure. No biggie.

Ok now for something called the Trokmag G-block (takes glock mags). It requires you to install it in two pieces into the magwell, a metal one, because it twisted to the side when the set screws were tightened. Well hell, I thought I was going to need to get a metal lower. Nope. I sat on it for a few hours then decided to run a drill bit down the set screw shaft, make an indent for the set screw. 20 minutes later, the G-block was installed and tweaked. Next came modification of the glock mags. The company said to only use Glock OEM mags. Pfffft, not me, I modified a magpul one as well. I had to tweak the magpul mag a bit but it works flawlessly and at 1/3 the price.

I took my new girl to the range and started pumping lead downrange. She performed flawlessly except for a few light primer strikes, The rounds were loaded back into a magazine and all fired the second go around. I will be getting another Hammer spring and this should resolve the issue. Ammo used was all ball, from 20 years old to brand new. Everything from no name reloads to Federal and Wally world Winchester white box. Again a few issues with the rounds mentioned earlier. Groups came in at around 3 inches at 50 yards. As soon as I can download the pictures I will post them up.

Sights are Dagger Defense pop up iron sights co-witnessed with on Bushnell 30mm red dot that was lying in a junk pile in my basement.

So a few hicupps along the road to building this new rifle. Oddly I never lost my temper too bad. Just a lot of hurry up and wait. Expect to take your time on a build like this. You will have to tinker and repeat. This is not for the average Joe that knows nothing about the AR platform. The ability to troubleshoot is extremely important to make a ground up build go well.

Project total: $600

EDIT: Here are the pics. We aren't allowed to have mags in during a cease fire, or when we are not at the bench, so no pic of the gun with mags yet. My shooting partner was sick today so I did the best with what I was allowed.

View attachment 362154 View attachment 362154 View attachment 362155 View attachment 362157 View attachment 362159 View attachment 362160 View attachment 362161 View attachment 362154
Way to go there ChrisMD. Out standing piece and O.K. shooting :couch: just kidding. You did a fantastic job all around in my book. Did you use the link I sent you?