Want to build a PCC

Gear Head

Gear Head

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Want to build a pcc to suppress but am not well versed on ar-9 stuff. I want to go pistol length (future sbr) but is there an ideal length to run suppressed? What lowers should I be looking at? I want a reliable LRBHO and glock mags.
 
I second Slacker on the side charger upper for suppressed. Keeps the blowback out of your face. I went with a Spartan side charger (Joeboboutdoors) which is a copy or made by gibbs. Pretty happy with it. If I had the coin I'd convert all my AR's to side chargers. Non reciprocating handle.

There are several makers of glock mag lowers and most say LRBHO. Joebob has several to get an initial idea. Sorry I can't comment on an exact brand.
 
Slacker said:
I like the QC10 lower and Gibbz side charge upper.
Sweet spot for barrel + can is 4-5" IMO.
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Was hoping for a longer barrel, got long arms lol. I should probably mention I'd be shooting light loaded blues exclusively (unless that wouldn't play well with a can).
 
+1 on the joebobs Spartan side charger. I built my pistol with that set and love it. I have another nfa clone set that isn't nearly as nice for my 16" PCC.
 
Gear Head said:
Was hoping for a longer barrel, got long arms lol. I should probably mention I'd be shooting light loaded blues exclusively (unless that wouldn't play well with a can).
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No reason you can't go longer.
I just add the length of the can + mount, add 5" for barrel, and your getting close to 16" again.
Keep in mind that AR barrel length measurements are kinda tricky since it sits back in the upper receiver due to barrel extension, and you lose 1.25" or more when the threads go into the suppressor mount.
 
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Do you definitely want an Ar9 platform? I'll suggest a CZ Scorpion as well.
 
Slacker said:
No reason you can't go longer.
I just add the length of the can + mount, add 5" for barrel, and your getting close to 16" again.
Keep in mind that AR barrel length measurements are kinda tricky since it sits back in the upper receiver due to barrel extension, and you lose 1.25" or more when the threads go into the suppressor mount.
Click to expand...

I would rather be closer to 16" than be jammed up and uncomfortable when shooting. FWIW I don't have a 9mm can yet so that leaves me options as well as far as going with something that will allow for direct thread both pistion and fixed. Fixed I could run a little longer rail if need be I would think.

JRHorne said:
Do you definitely want an Ar9 platform? I'll suggest a CZ Scorpion as well.
Click to expand...

I've considered a scorpion but I would run a tailhook and I'd really like to find someone with that setup since I'm not sure how it would feel ergonomically whereas I'm super comfortable with the ar platform.
 
Gear Head said:
I would rather be closer to 16" than be jammed up and uncomfortable when shooting. FWIW I don't have a 9mm can yet so that leaves me options as well as far as going with something that will allow for direct thread both pistion and fixed. Fixed I could run a little longer rail if need be I would think.



I've considered a scorpion but I would run a tailhook and I'd really like to find someone with that setup since I'm not sure how it would feel ergonomically whereas I'm super comfortable with the ar platform.
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After trying a few mounting options, I ended up with a three lug mount.
Direct thread can be a PITA with a carbine and 30rd mags.
You can't really grab it to check "snugness" under the handguard
(plus it's hot!)
The direct thread mounts often want to unscrew from the can, making it so you have to remove the hardguard (PITA.)

Some manner of QD seems to work best when tucking a can inside a handguard.
The ratchet style requires you to push the release...not an option under the handguard. That leaves the 3 lug.
 
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Slacker said:
After trying a few mounting options, I ended up with a three lug mount.
Direct thread can be a PITA with a carbine and 30rd mags.
You can't really grab it to check "snugness" under the handguard
(plus it's hot!)
The direct thread mounts often want to unscrew from the can, making it so you have to remove the hardguard (PITA.)

Some manner of QD seems to work best when tucking a can inside a handguard.
Click to expand...

Making me second guess the blackout pistol I built in preparation for my Omega that I was planning to run as direct thread...
 
Gear Head said:
Making me second guess the blackout pistol I built in preparation for my Omega that I was planning to run as direct thread...
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I run an omega and obsidian on direct threads on the range/farm, I don't compete. The trick is to screw down until snug then back off a bit and give it a wrist flick. If you're still concerned, going to a 3-lug is the fix for cans recessed into handguards, but you have added cost of the mounts. I believe the Dead air mounts will work with the Omega, but don't hold me to it. BigWaylon or Scott at Tarheelstatefirearms would be a good one to talk to about compatibility.
 
tod0987 said:
I run an omega and obsidian on direct threads on the range/farm, I don't compete. The trick is to screw down until snug then back off a bit and give it a wrist flick. If you're still concerned, going to a 3-lug is the fix for cans recessed into handguards, but you have added cost of the mounts. I believe the Dead air mounts will work with the Omega, but don't hold me to it. BigWaylon or Scott at Tarheelstatefirearms would be a good one to talk to about compatibility.
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Dead air will work, just expensive. $250 for the keymo adapter then $80-$90 per brake and I already have two 556 and one 30 cal asr brake. If I can find a dealer or someone that would swap my ASR stuff for keymo straight up I would do it.
 
All my pistol cans use gemtech pattern mounts. Keeps things simple and fairly inexpensive.

I found a TROS 5" 3lug barrel, the lugs are machined into the barrel. It works well.
No adapter to worry about.
 
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CHRIS_WNC said:
Are there any side chargers for leftys? Left port, left charging handle?


CHRIS
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There are two types of side charging uppers, reciprocating and non-reciprocating. This pertains to the latch you grab to rack the bolt. There are folks milling standard uppers and installing pins in the a standard bolt some on either side of the lower, but the pin reciprocates with the bolt. The ones mentioned above are non reciprocating that is the latch stays put and does not travel back with the bolt during firing.

Here is a Gibbs left handed upper. Port on the left and latch on the right. https://gibbzarms.com/product/g4-left-handed-side-charging-upper-receiver/

Here ya go https://gibbzarms.com/product-category/g9-products/g9-upper-receiver-ar15/
 
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Trying not to hijack this thread too much - but are the three lugs legit for 300 blackout? I have an obsidian 45 that I want to use for my 9mm PCC and 300 blk pistol. I'd love to be able to run a three lug for both applications.
 
Geerubb said:
Trying not to hijack this thread too much - but are the three lugs legit for 300 blackout? I have an obsidian 45 that I want to use for my 9mm PCC and 300 blk pistol. I'd love to be able to run a three lug for both applications.
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TROS made me one for my 300 blk threaded 5/8x24. Semi Custom job.
Works well with both my gemtech 3 lug mount and my Liberty 3 lug mount (rifle rated, gemtech pattern, btw.)
Be sure to go with a quality 3 lug adapter.
The tolerances are all over the map.

If I had my druthers, i would buy the adapter slightly oversized and hand fit it to my mount to avoid any wobble.

Avoid hkparts.com.

@Geerubb
Your welcome to try out my 3 lug setups.
Efland is just a skip up the highway from me.
 
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I think the first place to start is deciding if you want Glock mag or Colt mag (or HK mag if you have too much money). If that answer is easy for you, then you have a variety of choices. Also, when you say pistol length, what do you mean? I have a 4.5", 8.5", and 16" upper for my AR9. I haven't shot the 16" yet, but as cheap as these things are to build right now, especially if you don't buy a second charge handle and BCG, you're crazy not to give yourself the option to shoot the gun while your stamp paperwork clears. Even if you plan on bracing it and not filing a stamp, I'd think you'd want to consider a longer barrel like a 10.5" especially if you reload.
 
JRHorne said:
I think the first place to start is deciding if you want Glock mag or Colt mag (or HK mag if you have too much money). If that answer is easy for you, then you have a variety of choices. Also, when you say pistol length, what do you mean? I have a 4.5", 8.5", and 16" upper for my AR9. I haven't shot the 16" yet, but as cheap as these things are to build right now, especially if you don't buy a second charge handle and BCG, you're crazy not to give yourself the option to shoot the gun while your stamp paperwork clears. Even if you plan on bracing it and not filing a stamp, I'd think you'd want to consider a longer barrel like a 10.5" especially if you reload.
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Pretty sure I want Glock mags for availability. Barrel length I was thinking 8-10". I load 9mm and shoot exclusively 147's so loading subs is no problem. Haven't decided it if I would form 1 it or not. I have a pending SBR form 1 and thought about a mag block but I have no experience with them.
 
Gear Head said:
Pretty sure I want Glock mags for availability. Barrel length I was thinking 8-10". I load 9mm and shoot exclusively 147's so loading subs is no problem. Haven't decided it if I would form 1 it or not. I have a pending SBR form 1 and thought about a mag block but I have no experience with them.
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Guy on here was selling a Hahn mag block and a few Colt mags that you could try after building your upper. Decide it's not for you, just sell it for little to no loss.
 
All the more reason to start by just building an upper and doing the Hahn block lower to use on your current SBR.
 
JRHorne said:
All the more reason to start by just building an upper and doing the Hahn block lower to use on your current SBR.
Click to expand...

My only reservation with a mag block is the mag release being in front of the mag instead of the traditional AR location but I have no experience with them so I'm not sure how much of an inconvenience that would be.
 
A Hahn block does not move the mag release, it stays in the same AR location. You must have noticed the Stern mag block, it does move the mag release. My suppressed is a 5" barrel. Get the barrel to long and it will just increase the muzzle velocity and harder to load sub sonic. I am a fairly decent size guy at 6'4" 285 and my setup with the can is very close to 10.5" and I am not cramped at all.
 
I’ve built a QC10 (glock) with QC10 side charger upper in 9mm and 10mm. 9 runs great and LRBHO works fine. I’ve yet to get the 10 out for a test yet. :(
 
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