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View Full Version : Wanting a .45ACP AR completed carbine


RustyKnifeUSMC
02-27-17, 12:42
Does anyone know if there are any manufacturers selling completed AR carbines for .45ACP that use Glock 21 mags?

I know that Quarter Circle 10 does uppers, but uppers only.
CRAMBONE
02-27-17, 13:19
Quarter Circle 10 does make .45 Glock lowers.
interfan
02-27-17, 15:11
I believe New Frontier Armory does as well. I think they had one in their retail store the last time I was in there.
sidewaysil80
02-27-17, 16:03
Whats the concenus as far as blow-back vs gas? Is one more proven the other? More versatile?
SteyrAUG
02-27-17, 17:19
Whats the concenus as far as blow-back vs gas? Is one more proven the other? More versatile?

I don't know what the consensus is, but gas is unnecessary for most pistol caliber carbines. Trying to think of one that even exists.
NongShim
02-27-17, 19:16
I don't know what the consensus is, but gas is unnecessary for most pistol caliber carbines. Trying to think of one that even exists.

MPX is.
SteyrAUG
02-27-17, 21:11
MPX is.

Didn't know that. Any reason why?
Auto426
02-28-17, 00:53
Didn't know that. Any reason why?

My understanding is that the MPX was basically an offshoot of the MCX development, hence the operating system similarities. I think a large part of it was also that they thought they could after some of the LEO/MIL market with aging MP5's and a non-blowback system would give them a competitive edge over their mostly blowback competition.
SteyrAUG
02-28-17, 02:31
My understanding is that the MPX was basically an offshoot of the MCX development, hence the operating system similarities. I think a large part of it was also that they thought they could after some of the LEO/MIL market with aging MP5's and a non-blowback system would give them a competitive edge over their mostly blowback competition.

Is it DI or piston? Trying to understand what a gas unlocking system offers that is superior to straight blowback. I understand the advantages of closed bolt vs. open bolt when it comes to such systems, and I get that the delayed roller HK systems gives the MP5 a very smooth cycle. But what is a DI or piston gas system going to bring to the table? Won't it just rocket the bolt carrier to the rear at Mach 4.3?

I know it's pistol calibers but still. Even HK went back to their simple blowback on the UMP and just decided to make it a closed bolt setup.
call_me_ski
02-28-17, 12:15
It has the same tappet system of the MCX it is just right ahead of the chamber. Supposedly it is designed that way because a firearm that has a locking chamber will be quieter when fired suppressed vis-a-vis a blowback/delayed blowback gun.
foxtrotx1
02-28-17, 16:09
I suppose in theory a DI system lets you lower the reciprocating mass and reduce weight.... but they built it out of aluminum soo.... that ship sailed.

All reports I have seen have said that the Piston on the MPX jets way more gas back at the shooter.

Blowback is simpler...
thei3ug
02-28-17, 16:26
I know of two guys making DI .45 ACP upper groups for AR rifles. RMW Extreme and macon armory. to what extent they do conversions or will sell bolt groups, I don't know. I'm also unsure of the reliability. When people first started experimenting with DI .45 rifles, they seemed to foul up after 500 rounds or so, maybe that was a design issue that was solved in the past five years. I don't know. But they do exist. And they shoot soft. Way less mass necessary in both the bolt and the buffer. noticeably softer than blowback.

edit - here you go,

https://www.m4carbine.net/showthread.php?110653-AR45-RMW-DI45-REVIEW-*PIC-HEAVY*

https://www.m4carbine.net/showthread.php?132400-DDLES-Glock-Large-Frame-tweaks-to-function-with-a-DI45&p=1663110#post1663110
SteyrAUG
02-28-17, 16:48
It has the same tappet system of the MCX it is just right ahead of the chamber. Supposedly it is designed that way because a firearm that has a locking chamber will be quieter when fired suppressed vis-a-vis a blowback/delayed blowback gun.

Now I understand. Thanks.
misfit47
02-28-17, 18:42
The Macon machine di guns have been around and proven for a while. Softer shooting and reliable. You can get conversion or whole rifle/pistol.
MOLON AABE
03-01-17, 12:46
https://youtu.be/cKmNB0HBVsc

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