someguy2800
Member
I recently got the hankering for something different than my hipoint 9mm carbine. The hi point was pretty accurate but it was picky on ammunition and you had to sight it back in after cleaning. I looked at other 9mm options but decided to just do a colt pattern 9mm AR15. I chose the colt mag pattern over a glock mag lower because they are more universal on parts and because I don't have a glock and I don't care for the looks of an ar15 with a glock mag sticking out of it.
Here is the parts list
BCA dual charging upper (I have not settled on what upper to use, I stole this one off my 223 varmint rifle to test)
PSA complete 9mm colt style lower ($180)
ADK 9mm bolt ($94)
kak pistol brace ($45)
Faxon 10.5" barrel ($112)
ebay 12" forend ($25)
slim krink brake ($20)
ASC 20rnd mag ($16)
Once I got all the parts I took the barrel off my 223 upper to test this out. My intention is to put a suppressor on this once I finally get mine through the paperwork so what I would like to do is get a bear creek side charging upper without the rear charging handle to put all this on to reduce the gas blowback around the charging handle. The bolt has a nice flat on the side that lines up nicely with the slot on my BCA upper so if i do that I will just drill and tap it for a side charging handle.
When I finally got all the parts and put it together immediately there was a problem. You could not engage the magazine with the upper attached. The magazine was hitting the inside of the upper receiver rails, the ejector, and the bolt. If you retracted the bolt you could smack the mag and get it to seat but if you released the bolt it would jam on the right feed lip of the mag and lock the gun up.
I ended up bending the ejector a bit to clear the left feed lip, bending the right feed lip up a bit and grinding it down slightly to clear the bolt, and I had to put the rear of the mag in the bench vice and squeeze it in about .020" to fit inside the upper receiver. Finally the bolt catch was too long and was sitting on the middle of the magazine follower instead of the stepped part on the back. So I had to take the bolt stop out of the lower and grind back the tip about .060".
With all that sorted I did a trigger job on it with the pretravel screw in the grip screw hole and went out to shoot.
Excuse the ridiculous huge scope, that just what was already on the upper. When I get another upper to use on this I will get a 3x prism scope or something more appropriate.
So far it has functioned just fine with my 124gr FMJ handloads I shoot for action pistol. Here is the target at 30 yards sighting it in. You can see the low shots walking it up to the bullseye and then a 5 shot group.
The group above that I just shot one round onto the cardboard and then used that hole for the aiming point for the next 4 shots. I am happy so far with the accuracy. I will try it at longer range today.
I think it needs a bit more recoil spring and a rubber bumper or something inside the buffer tube. Bolt speed is a little violent.
Here is the parts list
BCA dual charging upper (I have not settled on what upper to use, I stole this one off my 223 varmint rifle to test)
PSA complete 9mm colt style lower ($180)
ADK 9mm bolt ($94)
kak pistol brace ($45)
Faxon 10.5" barrel ($112)
ebay 12" forend ($25)
slim krink brake ($20)
ASC 20rnd mag ($16)
Once I got all the parts I took the barrel off my 223 upper to test this out. My intention is to put a suppressor on this once I finally get mine through the paperwork so what I would like to do is get a bear creek side charging upper without the rear charging handle to put all this on to reduce the gas blowback around the charging handle. The bolt has a nice flat on the side that lines up nicely with the slot on my BCA upper so if i do that I will just drill and tap it for a side charging handle.
When I finally got all the parts and put it together immediately there was a problem. You could not engage the magazine with the upper attached. The magazine was hitting the inside of the upper receiver rails, the ejector, and the bolt. If you retracted the bolt you could smack the mag and get it to seat but if you released the bolt it would jam on the right feed lip of the mag and lock the gun up.
I ended up bending the ejector a bit to clear the left feed lip, bending the right feed lip up a bit and grinding it down slightly to clear the bolt, and I had to put the rear of the mag in the bench vice and squeeze it in about .020" to fit inside the upper receiver. Finally the bolt catch was too long and was sitting on the middle of the magazine follower instead of the stepped part on the back. So I had to take the bolt stop out of the lower and grind back the tip about .060".
With all that sorted I did a trigger job on it with the pretravel screw in the grip screw hole and went out to shoot.
Excuse the ridiculous huge scope, that just what was already on the upper. When I get another upper to use on this I will get a 3x prism scope or something more appropriate.
So far it has functioned just fine with my 124gr FMJ handloads I shoot for action pistol. Here is the target at 30 yards sighting it in. You can see the low shots walking it up to the bullseye and then a 5 shot group.
The group above that I just shot one round onto the cardboard and then used that hole for the aiming point for the next 4 shots. I am happy so far with the accuracy. I will try it at longer range today.
I think it needs a bit more recoil spring and a rubber bumper or something inside the buffer tube. Bolt speed is a little violent.
