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Old April 23rd, 2017, 05:03 PM #21
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Quote:
Originally Posted by shovel1966 View Post
I don't believe there is a "standard" 9mm lower. But to answer your question, the PSA uppers will "fit" a standard AR style lower. I guess it would depend on which lower you pin your PSA upper to whether it will work or not.

AR9s are similar to the AR308s (AR10) platform with respect ensuring each part used is compatible with all others in the build. This is a completely different concept than an AR-15 style rifle. The reason is because the AR-15 has a Mil-Spec and the parts made to fit Mil-Spec are all completely interchangeable.

Thanks. I have an Ar-15 lower with the midway mag block. It's colt pattern. Just looking for a working, but inexpensive carbine upper to use in uspsa pcc class.
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Old April 23rd, 2017, 05:20 PM #22
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Quote:
Originally Posted by shovel1966 View Post
I don't believe there is a "standard" 9mm lower. But to answer your question, the PSA uppers will "fit" a standard AR style lower. I guess it would depend on which lower you pin your PSA upper to whether it will work or not.

AR9s are similar to the AR308s (AR10) platform with respect ensuring each part used is compatible with all others in the build. This is a completely different concept than an AR-15 style rifle. The reason is because the AR-15 has a Mil-Spec and the parts made to fit Mil-Spec are all completely interchangeable.
I imagine that you're talking about this one:
http://palmettostatearmory.com/9mm-s...ffer-assy.html

Did you use a spacer with the buffer or just the buffer above (link) and a spring? Thank you for replies.
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Old April 23rd, 2017, 05:29 PM #23
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Not that is a ton of help, but I went with the Spikes st9x buffer and a standard cmmg spring and it's worked flawlessly so far.

I was planning on using the MASdefense 9mm buffer tube kit but it was out of stock for a long period of time when I built mine.
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Old April 23rd, 2017, 05:38 PM #24
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Quote:
Originally Posted by notfast View Post
Not that is a ton of help, but I went with the Spikes st9x buffer and a standard cmmg spring and it's worked flawlessly so far.

I was planning on using the MASdefense 9mm buffer tube kit but it was out of stock for a long period of time when I built mine.
I use an H-3 buffer with a Tubb's flat wire spring made for .308 ARs(think heavy duty) in a short(carbine length) buffer tube. It runs flawlessly without any bark(I run it full time suppressed).
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Old April 23rd, 2017, 06:36 PM #25
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Quote:
Originally Posted by notfast View Post
Not that is a ton of help, but I went with the Spikes st9x buffer and a standard cmmg spring and it's worked flawlessly so far.

I was planning on using the MASdefense 9mm buffer tube kit but it was out of stock for a long period of time when I built mine.
Helpful. Never have heard of MAS Defense. As far as springs go, I've read where many have said to use a heavy spring for 9mm build, for example, Wolff. Yet others, like you, have done well with a standard spring.
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Old April 23rd, 2017, 07:43 PM #26
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Anybody used the Kaw Valley Precision Solid Stainless Steel Blowback Buffer - 7.5oz along with the KVP Extra Power Buffer Spring sold by Joe Bob?
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Old April 23rd, 2017, 07:50 PM #27
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Anybody used the Kaw Valley Precision Solid Stainless Steel Blowback Buffer - 7.5oz along with the KVP Extra Power Buffer Spring sold by Joe Bob?
I used a complete KVP upper and BCG and couldn't say enough about customer service and quality. They seem to have the 9mm AR game down pretty well IMO
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Old April 24th, 2017, 08:05 AM #28
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I used a complete KVP upper and BCG and couldn't say enough about customer service and quality. They seem to have the 9mm AR game down pretty well IMO
Did that include their 9mm buffer?
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Old April 24th, 2017, 04:46 PM #29
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Did that include their 9mm buffer?
No. KVP upper with BCG. Phase 5 tube, spikes buffer, cmmg carbine spring is my set up.
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Old April 25th, 2017, 03:06 PM #30
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Quote:
Originally Posted by OnTarget View Post
I imagine that you're talking about this one:
http://palmettostatearmory.com/9mm-s...ffer-assy.html

Did you use a spacer with the buffer or just the buffer above (link) and a spring? Thank you for replies.
Yes, that is the exact buffer I used in both builds and I used a standard carbine buffer spring with no spacer. As I may have said, both have been working flawlessly for a while now.

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