PCC Sub Gun Omnibus Thread

[Melnic]

PCC AR9 reading has me running in circles. I did not do any dedicated thread but maybe I should.

I have 2 spare AR stripped lowers so I decided to take the plunge to get my feet wet. Not sure if I'll be up to my ankles or my neck

I ordered a 9mm kit, an additional 9mm upper assembly and Endo mag 3 pack.



kit

https://palmettostatearmory.com/psa...tweight-m-lok-railed-moe-sba3-pistol-kit.html

Upper assembly

https://palmettostatearmory.com/psa...e-7-lightweight-m-lok-upper-with-bcg-ch2.html

endo mag

https://www.opticsplanet.com/mean-arms-endomag-9mm-pmag-30-magazine-conversion-adapter.html



worse comes to worse I can dump what I bought and cut my losses. I"m looking mostly for the experience towards what ever is better and work my way up (yes and spend more $)



I did see some reports of success with the endo mags and these PSA uppers.

What can I expect from this kit/combo?



What is the basic issue on AR triggers and 9mm blowback uppers?

I read they are "hard" on the triggers, but what exactly is the issue and what do dedicated designed AR9 trigger assemblies do to midigate the issues w/ blowback?

Do those issues go away with Radial Delayed Blowback uppers?

PSA kits came in. It does not come with mag catch parts for the 9mm upper kits but I had the parts in my parts bin. Pic is for a tease cause the Endomag kits have not come in yet.
Put the parts kit onto an Engage Lower I had.
I ordered a 9mm kit, an additional 9mm upper assembly and Endo mag 3 pack.
Firefield sight on it now but if I have trouble with this cheap thing, I will bring a Sig Romeo5 with me.

I still have to lube up the bolt. I did throw in a laserlyte and clicked off a few at the wall across the long room just to check the gross sight alignment.

Hmm, that birdcage flash hider may have to go.
This is the 8" kit

 

[outrider58]

PSA kits came in. It does not come with mag catch parts for the 9mm upper kits but I had the parts in my parts bin. Pic is for a tease cause the Endomag kits have not come in yet.
Put the parts kit onto an Engage Lower I had.
I ordered a 9mm kit, an additional 9mm upper assembly and Endo mag 3 pack.
Firefield sight on it now but if I have trouble with this cheap thing, I will bring a Sig Romeo5 with me.

I still have to lube up the bolt. I did throw in a laserlyte and clicked off a few at the wall across the long room just to check the gross sight alignment.

Hmm, that birdcage flash hider may have to go.
This is the 8" kit

Lookin' good D! Welcome to the madness!

ETA: If you experience accuracy problems, back that red dot up so it isn't spanning both the upper and front rail.

 

[TinCuda]

.
Palmetto State Armory AK-V. An improved version of the Russian Spetsnaz Vityaz. 9mm and uses CZ Scorpion EVO magazines. I stuck a CNC Warrior brace on it.

 

[teratos]

.
Palmetto State Armory AK-V. An improved version of the Russian Spetsnaz Vityaz. 9mm and uses CZ Scorpion EVO magazines. I stuck a CNC Warrior brace on it.

That’s sexy.

 

[John from MD]

Very cool!

 

[JRisBundyboyz]

Now I’m debating the scorpion I’m waiting on. Nice looking setup.

 

[alucard0822]

Just got back from testing out a new build for the upcoming PSA shootout. Taccom superfeed superlight 16" barrel(5.25" barrel and a pinned sleeve) Taccom short stroke BCG, Aero EPC receivers, Hiperfire PDI trigger, Radian CH/selectors. 10oz KVP buffer, AR15 carbine spring, my 95lb/in and silicone cushion short stroke spacer. Carbon fiber handguard and topped with a 4moa C-more railway. Ends up about 5.8lbs, but balanced way rear/fast. Runs and shoots great, about 1.5"ish
group at 50 yards from a rest. Recoil is stupid light for 9mm, smooth and cycles fast. Feels pretty close to RDB builds, but cycles faster. Feels a bit lighter, but maybe a hair less smooth than the Blitzkreig short stroke comp setup.

Seems about the best i've gotten so far for reducing dot movement and recoil with a true blowback. Will see how it runs at the match. This is running a few quick strings on plates, and bump fire test. Ran through a few 40rd comp mags without fail. I was having bump fire issues with a heavier recoil spring, but the cushioned bumper and lighter spring cured it. Holding it light with my finger off the grip would have dumped the mag on a prior buffer setup with this 2# trigger. With this setup when trying to induce a malf/bump I fired 2 rounds, then hammer follow. So seems all is good with it.

View attachment 335830

View attachment 335831

View attachment 335832

 

[Melnic]

Lookin' good D! Welcome to the madness!

ETA: If you experience accuracy problems, back that red dot up so it isn't spanning both the upper and front rail.

Thx for looking out for me, I missed that and pulled it back.
I had pushed it foward cause I found it easier to focus and the power button was right by my thumb with my left hand making it easier to turn it on quickly or adjusting brightness. I'm not a "tactical" guy but did not feel it would hurt to try that out that way.

Taccom superfeed superlight 16" barrel(5.25" barrel and a pinned sleeve)

Alucard, edumacate me on the barrel, what is the purpose of the 5.25" barrel with a long sleeve vs a 16" barrel?

 

[alucard0822]

Thx for looking out for me, I missed that and pulled it back.
I had pushed it foward cause I found it easier to focus and the power button was right by my thumb with my left hand making it easier to turn it on quickly or adjusting brightness. I'm not a "tactical" guy but did not feel it would hurt to try that out that way.


Alucard, edumacate me on the barrel, what is the purpose of the 5.25" barrel with a long sleeve vs a 16" barrel?

First is that it is 15oz vs about 22oz for a lightweight contour 16". Second is a better pressure curve. In blowback the brass functions both as the lock and the piston. Fire it, and pressure /friction locks the brass in the chamber, as the bullet leaves the barrel pressure drops, there is less friction holding the case in place, and residual gas blows the case aggainst the bolt face for about 1/4" of powered movement. Inertia carries it through the rest of the extraction/ejection and feeding cycle. The buffer/bolt mass is what controls the bolt velocity, but the longer the barrel, the slower that residual gas pressure drops, the more power and residual gas blows into the action.

So shorter barrels inherently run cleaner with more consistent bolt velocity and less gas in the face. There is also a theory that the pressure wave of gas heading out the larger diameter outer tube and mass of the gas can induce a vaccum pulse that can pull some residual gas out the barrel and keep it cleaner than it would be with the same length barrel without a shroud. Kinda like a tuned exhaust scavenging combustion gasses in an engine. Not sure if it's enough to notice, but I do have the same barrel without a shroud in another upper to run a tucked suppressor or 5" 3 lug flash can unsuppressed. It's at least as clean as that without the can, and noticeably cleaner after a couple hundred rounds than my longer barreled AR9s.

 

[outrider58]

Thx for looking out for me, I missed that and pulled it back.
I had pushed it foward cause I found it easier to focus and the power button was right by my thumb with my left hand making it easier to turn it on quickly or adjusting brightness. I'm not a "tactical" guy but did not feel it would hurt to try that out that way.

Some people push them forward as well. My eyes ain't that good anymore.

 

[calicojack]

Just got back from testing out a new build for the upcoming PSA shootout. Taccom superfeed superlight 16" barrel(5.25" barrel and a pinned sleeve) Taccom short stroke BCG, Aero EPC receivers, Hiperfire PDI trigger, Radian CH/selectors. 10oz KVP buffer, AR15 carbine spring, my 95lb/in and silicone cushion short stroke spacer. Carbon fiber handguard and topped with a 4moa C-more railway. Ends up about 5.8lbs, but balanced way rear/fast. Runs and shoots great, about 1.5"ish
group at 50 yards from a rest. Recoil is stupid light for 9mm, smooth and cycles fast. Feels pretty close to RDB builds, but cycles faster. Feels a bit lighter, but maybe a hair less smooth than the Blitzkreig short stroke comp setup.

Seems about the best i've gotten so far for reducing dot movement and recoil with a true blowback. Will see how it runs at the match. This is running a few quick strings on plates, and bump fire test. Ran through a few 40rd comp mags without fail. I was having bump fire issues with a heavier recoil spring, but the cushioned bumper and lighter spring cured it. Holding it light with my finger off the grip would have dumped the mag on a prior buffer setup with this 2# trigger. With this setup when trying to induce a malf/bump I fired 2 rounds, then hammer follow. So seems all is good with it.

Nice!

 

[Melnic]

I reload my 9mm. I"m planning to run up some 119FMJ and 125 Powder coated with some W231. I thought I had some left but I don't. I had a BUNCH of bullseye powder and nearly all my built up reloads has BE. but that stuff is dirty, am I wrong to say that I would want a cleaner burning powder with a blow back 9mm AR?

 

[John from MD]

I reload my 9mm. I"m planning to run up some 119FMJ and 125 Powder coated with some W231. I thought I had some left but I don't. I had a BUNCH of bullseye powder and nearly all my built up reloads has BE. but that stuff is dirty, am I wrong to say that I would want a cleaner burning powder with a blow back 9mm AR?

No powder burns clean in a blowback. It is just the nature of the beast. I use 231 loads in 9mm and, in my Kel tec 2000, it burned just as dirty as Red Dot.

 

[alucard0822]

I reload my 9mm. Im planning to run up some 119FMJ and 125 Powder coated with some W231. I thought I had some left but I don't. I had a BUNCH of bullseye powder and nearly all my built up reloads has BE. but that stuff is dirty, am I wrong to say that I would want a cleaner burning powder with a blow back 9mm AR?

Loading for PCCs is weird, most RN bullets function with a decent buffer system. Heavier buffers make a difference in keeping it clean, but by their nature, blowback is filthy.
Heavier bullets and faster powders tend to have smoother recoil, but more sight movement, lighter/faster loads have more slap in recoil, but it's lighter with less sight movement. Powder makes a huge difference, I run 124gr plated over 4.8gr of CFE pistol and CCI SP primers to 1.160. CFE pistol is medium to slow between Power pistol and Blue dot. It's really clean, and I guess tends to have more residual gas to eject well with lighter loads and less powder. Usually using lighter bullets work better with faster powders, might have issues with light loads needing a bit less buffer weight to function, or loaded a little hotter. Some seems to cycle a bit rough especially in longer barrels and get really dirty with slower powders. Mine are relatively clean and relatively quiet when suppressed.

 

[outrider58]

I'll throw a flashlight on it and call it done. Still needs some range time. There are a lot of parts that are not meant for each other, so I'm prepared for some final fitting.

 

[teratos]

I'll throw a flashlight on it and call it done. Still needs some range time. There are a lot of parts that are not meant for each other, so I'm prepared for some final fitting.

That’s a sweet looking rifle.

 

[woodline]

I'll throw a flashlight on it and call it done. Still needs some range time. There are a lot of parts that are not meant for each other, so I'm prepared for some final fitting.

Who makes the grippy stuff on the rail?

 

[Melnic]

Nice and compact looking piece there. What is that thing on the top in front of the red dot but before the "grippy stuff"?

 

[smdub]

What is that thing on the top in front of the red dot but before the "grippy stuff"?

Looks like a Caldwell brass catcher mount

 

[teratos]

Who makes the grippy stuff on the rail?

Great question!!