Another ar9 thread

[Red9]

Wanted to build the ar9 for many reasons. However the costs are a bit high. Then I scored a New Frontier lower for a good price. It was a 80, bit no big deal.
Milled and there it sat. Patiently in the corner of the safe.
Fast forward, psa has a sale. 16 inch, melonite barrel, free float bcg too.
Parts list,
Anderson lpk, polished hammer and sear.
Standard m4 buffer, spring, 1.75 in quarters.
Nfa 80 lower.
Psa upper with ramped bcg.

First 50 rounds I had feeding issues. Rounds would not feed in the chamber but rather hung up amd dented the cases. After 100 rounds it seemed to run really great. Accuracy was better than expected even tho we were shooting only 25 yards.
Yes, psa is gtg with the Nfa lower. Lots of fun cheap to shoot.

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[amgsf]

I have a NFA 9mm lower. Any idea why if hung up for 1st 50 rounds?

[Red9]

I have a NFA 9mm lower. Any idea why if hung up for 1st 50 rounds?

Maybe new? Unsure. I oiled the bcg and it ran much better. Also tried different mags. Liked the blocked 10s better than the neutered g17 mags.


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[amgsf]

Thanks.. Did you use a one piece BCG vs the interchangeable. I think I read a mention that the variable one was problematic.

[Red9]

Thanks.. Did you use a one piece BCG vs the interchangeable. I think I read a mention that the variable one was problematic.

Bcg is from palmetto as well. Carrier is one piece with ramp. I still need to get the 9mm buffer.

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[Spyder]

Yep, I've got an NFA 80 and a dros'd one. One for 9mm, one for 40. Great fun!

[someoneeasy]

Bcg is from palmetto as well. Carrier is one piece with ramp. I still need to get the 9mm buffer.

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You can always throw some quarters in your buffer tube also, I got about $1.75 down mine.

[Red9]

Yep, I've got an NFA 80 and a dros'd one. One for 9mm, one for 40. Great fun!

I actually was looking for a ,40. But palmetto had this sale....

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[Red9]

You can always throw some quarters in your buffer tube also, I got about $1.75 down mine.

I'm running the same, 1.75 in mine. I have heard the 9mm buffer is best? Idk. First 9 build.

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[baranski]

Maybe new? Unsure. I oiled the bcg and it ran much better. Also tried different mags. Liked the blocked 10s better than the neutered g17 mags.


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Try 9mm followers in the neutered mags, that's whats in the STD mag.

[amgsf]

I changed out my 10 round #2183 round followers for 9mm-3 for my G19. I called Glock & told them I was having feeding issues. They sent me 4 replacements for free..just had to send a picture of my mags showing older followers.

[Joezamboni]

I'm running a similar variant of PSA upper. The Palmetto 9mm buffer is just a little heavier and still requires $1.75 in quarters so you don't break the bolt catch. I installed the slash's heavy 9mm buffer that doesn't require quarters. The spike's version accomplishes the same thing when it's available. It does "feel" better than the PSA buffer and I get much less unburned powder in the receiver.

During the first 300 rounds mine jammed once per magazine. I'm using a Hahn dedicated mag block and metalform mags. Then suddenly the last trip to the range it didn't jam at all, even with the problematic hollow points.

[Red9]

I'm running a similar variant of PSA upper. The Palmetto 9mm buffer is just a little heavier and still requires $1.75 in quarters so you don't break the bolt catch. I installed the slash's heavy 9mm buffer that doesn't require quarters. The spike's version accomplishes the same thing when it's available. It does "feel" better than the PSA buffer and I get much less unburned powder in the receiver.

During the first 300 rounds mine jammed once per magazine. I'm using a Hahn dedicated mag block and metalform mags. Then suddenly the last trip to the range it didn't jam at all, even with the problematic hollow points.

How's the 9mm buffer? If you run the buffer then I can take out the quarters?

Btw what happens if I just run the m4 buffer with quarters?

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[Joezamboni]

There's less weight holding the bolt in place, so it goes back faster not allowing for the charge to burn completely in the chamber. This was really noticeable with my reloads running a slightly slower powder like AA#5 which I thought would be better with the longer barrel. Not so noticeable with a faster powder like HP38.

I wasn't satisfied with the Slash buffer. Expensive, long enough where I had to turn the buffer tube out one turn or it wouldn't hold on the bolt catch. The buffer retainer still stays in place, but barely. I'd look for the spikes tactical instead. The PSA just seems like a heavy buffer carbine buffer.

The PSA buffer requires quarters, the spikes and slash 9mm buffers don't.

[Red9]

There's less weight holding the bolt in place, so it goes back faster not allowing for the charge to burn completely in the chamber. This was really noticeable with my reloads running a slightly slower powder like AA#5 which I thought would be better with the longer barrel. Not so noticeable with a faster powder like HP38.

I wasn't satisfied with the Slash buffer. Expensive, long enough where I had to turn the buffer tube out one turn or it wouldn't hold on the bolt catch. The buffer retainer still stays in place, but barely. I'd look for the spikes tactical instead. The PSA just seems like a heavy buffer carbine buffer.

The PSA buffer requires quarters, the spikes and slash 9mm buffers don't.

Yes, I noticed my lower was dirty as well as upper.
I'm running 4 gr tight group with 115 plated. Oal 1.25 . Very dirty.

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