Thinking about building a PCC, AR in .45 ACP

[P-12 Norm]

Seems the uppers and lowers are not as common as I would have thought.
Any one else built one, and have suggestions?
Go ahead, inundate me with ideas and suggestions!
I was thinking a non-reciprocating side-cocker, but want to heard from the experts./

 

[alucard0822]

There are a few people I know that built them, usually finnicky and underwhelmed. Seems the general advice is 9mm or nothing, especially with blowback.

I would DEFINITELY look into something like building on a CMMG Banshee RDB setup, delayed blowback really shines in larger calibers. It can be done with blowback and G21 mags, but the magwell has to be wider than the AR15 platform normally has, so there tends to be fewer companies that make them, and pins, mag catches and LRBHO tend to be one off parts. There are a few that use 20rd 1911 mags or UMP mags, including Macon's conversion block, about the only way to build a 45 PCC on a standard AR15 lower. I did shoot the Juggernaut AR45 and hated it, recoil is really harsh, being blowback that didn't seem tuned all that well. There are some non-AR PCCs that might be cool, Ruger has a new one, and of course a Thompson clone is always cool.

 

[smokey]

BC-45 | .45 ACP Right Side Charging Rifle | 16" Parkerized Government Barrel | 1:16 Twist | Blowback | 15" MLOK | No Magazine

Discover the perfect .45 ACP Right Side Charging Rifle 16" Parkerized Government Barrel at Bear Creek Arsenal. Save today on a high quality BC-45 Rifle!

www.bearcreekarsenal.com

this seems interesting. Otherwise, there are a bunch of other non-ar .45 PCCs that might be better... like if you can still snag a .45 beretta cx4 or something.
And +1 for a thompson. It lacks a lot of features over a modern PCC, but damn they are cool. I haven't shot one in a while... but I reallllllllly liked it.

 

[outrider58]

Paging @calicojack ...

 

[RFBfromDE]

Hi-Point

 

[outrider58]

BC-45 | .45 ACP Right Side Charging Rifle | 16" Parkerized Government Barrel | 1:16 Twist | Blowback | 15" MLOK | No Magazine

Discover the perfect .45 ACP Right Side Charging Rifle 16" Parkerized Government Barrel at Bear Creek Arsenal. Save today on a high quality BC-45 Rifle!

www.bearcreekarsenal.com

this seems interesting. Otherwise, there are a bunch of other non-ar .45 PCCs that might be better... like if you can still snag a .45 beretta cx4 or something.
And +1 for a thompson. It lacks a lot of features over a modern PCC, but damn they are cool. I haven't shot one in a while... but I reallllllllly liked it.

Love that gun...

 

[Biggfoot44]

Back in the day , when Oly Arms was blazing the trail for Pistol Cal AR , their .45acp used then common Grease Gun mags .

 

[outrider58]

Seems the uppers and lowers are not as common as I would have thought.
Any one else built one, and have suggestions?
Go ahead, inundate me with ideas and suggestions!
I was thinking a non-reciprocating side-cocker, but want to heard from the experts./

If it's a carbine you have in mind, I would strongly consider the CMMG RDB

Radial Delayed Blowback Rifle Conversion Kit, 45 ACP | CMMG - AR 15 and AR 10 Builds and Parts

Convert your 45 ACP BANSHEETM MkG from pistol to carbine with the CMMG® Radial Delayed Blowback Rifle Conv

cmmg.com

Pistol AR? They have that too!

Barrel and BCG Kit, 8" 4140CM, SBN, 45ACP | CMMG - AR 15 and AR 10 Builds and Parts

The MkG 8” Barrel and BCG Kit in 45ACP allows you to build a Pistol Caliber Carbine using our Patent Pending Radia

cmmg.com

These things really run nicely. Very good dot control.

 

[outrider58]

You'll probably need one of these lowers. I believe they say a standard upper will work with these lowers. You can ask them if you go this route. They are very good with inquiries.

Lower Receiver Assembly, MkGs(Lower receiver, mag catch, BHO Linkage) | CMMG - AR 15 and AR 10 Builds and Parts

Inspired by the success of the original MkG, the MkGs lower receiver is designed to accept either 9mm or .40 S&W Glo

cmmg.com

 

[calicojack]

Hi. I built two 45 ACP PCC's. One standard blowback, the other radial delayed blowback. The radial delayed probably twice the money but a really nice shooter and reliable and does not require any tuning.

If you want to build a Banshee clone, get your CMMG lower, barrel and bolt from someone other than CMMG and you'll save like $200. You may have to wait 2 weeks to get though.

I got the upper and hand guard from CMMG so it's pretty close to a Banshee without spending $1700 and they match the lower. You can then put your own trigger and furniture on it. If you want you can get CMMG's lower parts kit but it's pricey and I wanted my own furniture and trigger. You can use any AR trigger.

I will look and see if I can find out who I ordered my parts from (don't remember off the top of my head). The CMMG upper and lower are Cerakoted and well-made.

 

[calicojack]

There are a few people I know that built them, usually finnicky and underwhelmed. Seems the general advice is 9mm or nothing, especially with blowback.

I would DEFINITELY look into something like building on a CMMG Banshee RDB setup, delayed blowback really shines in larger calibers. It can be done with blowback and G21 mags, but the magwell has to be wider than the AR15 platform normally has, so there tends to be fewer companies that make them, and pins, mag catches and LRBHO tend to be one off parts. There are a few that use 20rd 1911 mags or UMP mags, including Macon's conversion block, about the only way to build a 45 PCC on a standard AR15 lower. I did shoot the Juggernaut AR45 and hated it, recoil is really harsh, being blowback that didn't seem tuned all that well. There are some non-AR PCCs that might be cool, Ruger has a new one, and of course a Thompson clone is always cool.

I used a Macon armory block and it accepts HK USC mags but they don't make it any more. Too bad because it runs well. I think OP is better off with a dedicate RDB lower that takes Glock mags.

 

[calicojack]

OP I don't know if you are going pistol or rifle.

Here is a great price on a 8" and 16" barrel/bolt combo

CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit Includes Blazin' Deal w/ Free S&H — 3 models

Shop CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit | Be The First To Review CMMG, Inc .45ACP Barrel and Bolt Carrier Group Kit Blazin' Deal + Free Shipping over $49.

www.opticsplanet.com

The lower from CMMG. You can choose a Cerakote color.

Lower Receiver Assembly, MkG(Lower receiver, mag catch, BHO Linkage) | CMMG - AR 15 and AR 10 Builds and Parts

The original entry in the Radial Delayed Blowback series, the CMMG MkG Lower Assembly is perfect for anyone wanting to b

cmmg.com

Matching Upper. Can also choose a color.

Upper Receiver Assembly, Mk4/ AR15 | CMMG - AR 15 and AR 10 Builds and Parts

Expertly crafted from aircraft grade aluminum, CMMG® Mk4/AR15 upper receiver assemblies come with our ZEROED® Po

cmmg.com

 

[Bafflingbs]

My 9mm works fantastic! I don’t know how the .45 will work. https://getstern.com/mag-ad-w-mod5-15-m-lok-16-1barrel-45acp-rifle-upper-kit/

 

[RRomig]

JMO but I would minimally buy matched upper and lower.

 

[alucard0822]

I was thinking

I used a Macon armory block and it accepts HK USC mags but they don't make it any more. Too bad because it runs well. I think OP is better off with a dedicate RDB lower that takes Glock mags.

View attachment 467477

About your builds when this came up, you do your homework on this stuff, and have some cool rifles to show for it. Macon makes decent stuff, their current AR45 adapter takes 1911 mags instead of UMP. Really wish someone would come up with a gas delayed blowback upper for PCCs. ARs probably would be easier to adapt to standard uppers than roller delay, and tends to work very well with a wide variety of ammo and running suppressed.

 

[P-12 Norm]

You'll probably need one of these lowers. I believe they say a standard upper will work with these lowers. You can ask them if you go this route. They are very good with inquiries.

Lower Receiver Assembly, MkGs(Lower receiver, mag catch, BHO Linkage) | CMMG - AR 15 and AR 10 Builds and Parts

Inspired by the success of the original MkG, the MkGs lower receiver is designed to accept either 9mm or .40 S&W Glo

cmmg.com

Wow. I'd been on Pro2A before, but never realized they had all that, at really reasonable prices, too.
Looks like when I finish the .204 build, I'll be set at this place. Might even submit a Form 1 and SBR the .45...

Thanks.

 

[Slackdaddy]

Is it just me? or does anyone else hate the looks of a PCC lower with a full size 5.56 magwell with a little 9mm mag in it?? looks like some kluged together BS

 

[outrider58]

Is it just me? or does anyone else hate the looks of a PCC lower with a full size 5.56 magwell with a little 9mm mag in it?? looks like some kluged together BS

Not just you. That's why I...

 

[calicojack]

I was thinking

About your builds when this came up, you do your homework on this stuff, and have some cool rifles to show for it. Macon makes decent stuff, their current AR45 adapter takes 1911 mags instead of UMP. Really wish someone would come up with a gas delayed blowback upper for PCCs. ARs probably would be easier to adapt to standard uppers than roller delay, and tends to work very well with a wide variety of ammo and running suppressed.

The Macon option would also be a good one using a standard AR lower. Kind of what I did except now with a different mag format. My Macon adapter has been running well with the RDB. Lot's of choices out there OP.

All AR-45 Upper Receivers

Macon Armory's AR-45 flagship upper is designed to satisfy the needs and budget of collectors, sport shooters and DIY builders. Our 100% American-made direct impingement (DI) and blowback (BB) uppers come in a variety of barrel lengths and are available by themselves or as part of a complete...

maconarmory.com

 

[Slackdaddy]

Not just you. That's why I...

View attachment 467628

Your lacking on accessories for that top rail?