RRA vs CMMG Need advice - Page 2

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[ARCHIVED THREAD] - RRA vs CMMG Need advice (Page 2 of 2)

Posted: 4/10/2006 8:30:15 AM EDT

[#1]

Quoted:
Who makes CMMG barrels and what quality steel are they?Are there bolts and carriers DPMS?

4150

Posted: 4/10/2006 8:34:16 AM EDT

[#2]

Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?Are there bolts and carriers DPMS?

4150

Just like Bushmaster

Posted: 4/10/2006 8:34:53 AM EDT

[#3]

Quoted:
I thought CMT made RRA's receivers?

It's possible, but the RRA receivers I bought were of much better fit and quality than the CMT/Stag receivers.

Posted: 4/10/2006 11:27:38 AM EDT

[#4]

Quoted:
Who makes CMMG barrels and what quality steel are they?
Are there bolts and carriers DPMS?

There barrel steel is 4150

I donn't beileve there BCG is DPMS because it is the enhanced carrier with the suraded firing pin.

Posted: 4/10/2006 12:34:45 PM EDT

[#5]

Quoted:
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people are always talking about how great RRA's fit and finish is, how does CMMG compare in that respect?

It depends on who makes their upper/lower receivers and parts. I've tried CMT/Stag and the overall fit/quality isn't as good as RRA.

So which companies make their uppers/lowers? Just CMT/Stag?...........

anyone know?

Posted: 4/10/2006 8:05:56 PM EDT

[#6]

Quoted:
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They make their own barrels.

They do?

In the same capacity as Bushmaster IIRC

The manufacturer of their barrels used to post here, though I cannot remember the name. I would be surprised to find out that they had invested in the tooling to make barrels in house.

Posted: 4/10/2006 8:11:17 PM EDT

[#7]

Quoted:
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They make their own barrels.

They do?

In the same capacity as Bushmaster IIRC

The manufacturer of their barrels used to post here, though I cannot remember the name. I would be surprised to find out that they had invested in the tooling to make barrels in house.

I believe they buy the blanks, camber and profile them, send them out to be cromed and they park them.

Posted: 4/10/2006 8:18:27 PM EDT

[#8]

Thanks

Posted: 4/10/2006 8:25:07 PM EDT

[#9]

They are expanding their shop quite abit though so they might start doing even more of their own work

Posted: 4/11/2006 3:54:01 AM EDT

[#10]

Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?
Are there bolts and carriers DPMS?

There barrel steel is 4150

I donn't beileve there BCG is DPMS because it is the enhanced carrier with the suraded firing pin.

Just got my first CMMG upper. The BC is definitley not DPMS. Firing pin is shrouded.

Posted: 4/11/2006 5:11:36 AM EDT

[#11]

Quoted:
Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?
Are there bolts and carriers DPMS?

There barrel steel is 4150

I donn't beileve there BCG is DPMS because it is the enhanced carrier with the suraded firing pin.

Just got my first CMMG upper. The BC is definitley not DPMS. Firing pin is shrouded.

I believe CMMG uses CMT BCG's. Is there what looks like a line going across the bolts holding the key in??

Posted: 4/11/2006 5:15:53 AM EDT

[#12]

Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?Are there bolts and carriers DPMS?

4150

Not all 4150 is the same though. There are different grades or tiers if you will. The military has a standard for 4150 (MIL-B-11595E). For more info on the subject: www.ar15.com/forums/topic.html?b=2&f=138&t=148891

At this point and time, I think only 2 companies use the mil-standard for 4150. They are FN, and BCM.

Edited to update guestimate that Colt barrels followed the Mil specification for 4150.

Posted: 4/11/2006 5:23:08 AM EDT

[#13]

Quoted:
Quoted:
Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?
Are there bolts and carriers DPMS?

There barrel steel is 4150

I donn't beileve there BCG is DPMS because it is the enhanced carrier with the suraded firing pin.

Just got my first CMMG upper. The BC is definitley not DPMS. Firing pin is shrouded.

I believe CMMG uses CMT BCG's. Is there what looks like a line going across the bolts holding the key in??

You mean the improperly staked gas key screws? If so, that's probably a CMT/Stag BCG. That said, I don't know of many people that had to re-stake their CMTs, but RRA and Colt do it differently, as does Bushmaster IIRC. I do not know about DPMS, but Tweak's thread covered a variety of different staking methods. CMT's staking method was an example of what not to do.

Posted: 4/11/2006 5:27:56 AM EDT

[#14]

Quoted:
Quoted:
Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?
Are there bolts and carriers DPMS?

There barrel steel is 4150

I donn't beileve there BCG is DPMS because it is the enhanced carrier with the suraded firing pin.

Just got my first CMMG upper. The BC is definitley not DPMS. Firing pin is shrouded.

I believe CMMG uses CMT BCG's. Is there what looks like a line going across the bolts holding the key in??

Yes, It seems very deep. Too deep if you ask me.

Posted: 4/11/2006 5:42:53 AM EDT

[#15]

Quoted:
Quoted:
Quoted:
Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?
Are there bolts and carriers DPMS?

There barrel steel is 4150

I donn't beileve there BCG is DPMS because it is the enhanced carrier with the suraded firing pin.

Just got my first CMMG upper. The BC is definitley not DPMS. Firing pin is shrouded.

I believe CMMG uses CMT BCG's. Is there what looks like a line going across the bolts holding the key in??

Yes, It seems very deep. Too deep if you ask me.

Then you have a CMT BCG. These are not staked correctly. I would suggest that you get it staked as soon as possible.

Posted: 4/11/2006 5:52:48 AM EDT

[#16]

Quoted:
Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?Are there bolts and carriers DPMS?

4150

Not all 4150 is the same though. There are different grades or tiers if you will. The military has a standard for 4150 (MIL-B-11595E). For more info on the subject: www.ar15.com/forums/topic.html?b=2&f=138&t=148891

At this point and time, I think only 3 companies use the mil-standard for 4150. They are FN, Colt and BCM.

LMT and Sabre Defence use CMV for their barrels which are MIL-B-11595E spec as shown in Bravo Company's post that you linked to.

BTW, the post by Bravo Company also indicates that a Colt barrel was tested and found to be CMV not ORD4150.

ETA: BCM is also using CMV not ORD4150. See here ->www.bravocompanyusa.com/AboutBCM.html.

Posted: 4/11/2006 6:42:48 AM EDT

[#17]

Quoted:
Quoted:
Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?Are there bolts and carriers DPMS?

4150

Not all 4150 is the same though. There are different grades or tiers if you will. The military has a standard for 4150 (MIL-B-11595E). For more info on the subject: www.ar15.com/forums/topic.html?b=2&f=138&t=148891

At this point and time, I think only 3 companies use the mil-standard for 4150. They are FN, Colt and BCM.

LMT and Sabre Defence use CMV for their barrels which are MIL-B-11595E spec as shown in Bravo Company's post that you linked to.

BTW, the post by Bravo Company also indicates that a Colt barrel was tested and found to be CMV not ORD4150.

I would have to see some proof that LMT and Sabre do (as I have heard other wise).

Posted: 4/11/2006 7:35:46 AM EDT

[#18]

Quoted:

I would have to see some proof that LMT and Sabre do (as I have heard other wise).

See the link below for Sabre's catalog in PDF format. It states that their non-stanless barrels are MIL-B-11595 Vanadium Alloy which is basically CMV as per the spec sheet.

www.sabredefence.com/SDI_2006_retail_1st_edition_Catalog_FINAL.pdf

More details on the Sabre barrels on the thread below.

archive.ar15.com/forums/topic.html?b=3&f=118&t=235033&page=7

Here's the markings on my Talon Arms/Sabre Defence chrome lined, 16", 1-7, mid-length barrel.

I've seen mention of the LMT using CMV many times here and other places. Let me do some checking and I will post back here.

Posted: 4/11/2006 8:06:26 AM EDT

[#19]

Quoted:
Quoted:
Quoted:
Quoted:
Quoted:
Who makes CMMG barrels and what quality steel are they?
Are there bolts and carriers DPMS?

There barrel steel is 4150

I donn't beileve there BCG is DPMS because it is the enhanced carrier with the suraded firing pin.

Just got my first CMMG upper. The BC is definitley not DPMS. Firing pin is shrouded.

I believe CMMG uses CMT BCG's. Is there what looks like a line going across the bolts holding the key in??

You mean the improperly staked gas key screws? If so, that's probably a CMT/Stag BCG. That said, I don't know of many people that had to re-stake their CMTs, but RRA and Colt do it differently, as does Bushmaster IIRC. I do not know about DPMS, but Tweak's thread covered a variety of different staking methods. CMT's staking method was an example of what not to do.

Did a search and couldn't find Tweaks thread. Can anyone provide a link?

Is this a different way of staking it or just "not like so and so"

Thanks

Posted: 4/11/2006 2:19:57 PM EDT

[#20]

Anyone out there actually shot their key loose when staked like this??

Posted: 4/11/2006 4:12:55 PM EDT

[#21]

Quoted:
Anyone out there actually shot their key loose when staked like this??

Yes. Take an allen wrench and move the screw (is easy to do). Vibration is a son of a bitch and will back out anything that is not staked and or loctited.

[ARCHIVED THREAD] - RRA vs CMMG Need advice (Page 2 of 2)

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