New & Newer CMMG Barrels

[Col_Crocs]

What's the difference between CMMG's "new production" and "new production Milspec" barrels? They seem to have the same features and been through the same testing. Could it be the gas port size?
Are they slowly facing out the older "new production" and replacing it with the "new production Milspec" barrels?

[28_days]

Where did you get/see this information? I can't say I've heard anything to date.

I'm still waiting for my 16" mid-length lightweight to get here.

[Stickman]

What wasn't milspec about them before?

[C4IGrant]

Originally Posted by Stickman

What wasn't milspec about them before?

Just about everything (steel, testing, etc).



C4

[K9-Bob]

Originally Posted by C4IGrant

Just about everything (steel, testing, etc).



C4

What was the issue with the steel?

[Robb Jensen]

Originally Posted by K9-Bob

What was the issue with the steel?

For the vast majority (aka 99%) of people the barrel steel is fine with CMMG barrels. 10% of the people who think they need better than CMMG don't and the other 89% couldn't tell you the difference between CMMG and Colt/BCM or LMT nor why you would want the latter............YMMV.

I'm just sayin'

Sure I do wear out barrels about every 10-15K rounds with non-milspec steel, yada yada yada with my 3gun rifle. They headspace fine when I replace them but the throat is so far gone, that they shoot patterns instead of groups. It's not from the quality of the steel that I wear out barrels it is the way that I use them, 60 rounds though it in 45 seconds A LOT wears out the throat faster than 60 rounds in 45 minutes. The throat is gone and sure I could continue use of them for the vast majority of the 3gun shooting and training that I do (which is typically 150yds in and closer). When I replace a barrel on my 3gun rifle most of them will still keep a 3-4" group or slightly better at 100yds. BUT sometimes I shoot matches that include targets at 300yds+ so I want to be damn sure I can hit those targets making sure it's not a hardware problem if I miss that far out. I want to make sure it's a software problem and not a hardware problem and that it's the indian and not the arrow. As always YMMV.

[Bimmer]

Originally Posted by 28_days

I'm still waiting for my 16" mid-length lightweight to get here.

Me, too. I ordered on built on an A2 upper in the middle of May. I just heard last week that it "fell through the cracks." Now it should have shipped yesterday. Maybe next week I'll have it...

Ben

[28_days]

Originally Posted by C4IGrant

Just about everything (steel, testing, etc).



C4

But those problems have been corrected right? Any idea when they made the switch? I've never heard (besides the chart) that anything other than 4150 was used, well at least not lately.

It'd be nice if the OP would stop by and explain what he meant. Not that it's a huge deal, but I'm a bit curious at this point.

[C4IGrant]

Originally Posted by K9-Bob

What was the issue with the steel?

It is not mil-spec. They also do not HPT each and every barrel.


C4

[28_days]

Originally Posted by C4IGrant

It is not mil-spec. They also do not HPT each and every barrel.


C4

Does mil-spec refer specifically to the steel (4150 I believe), or a process or refinement?

[C4IGrant]

Originally Posted by 28_days

Does mil-spec refer specifically to the steel (4150 I believe), or a process or refinement?

Read this: http://www.m4carbine.net/showthread.php?t=37



C4

[28_days]

Originally Posted by C4IGrant

Read this: http://www.m4carbine.net/showthread.php?t=37



C4

Thank you!

[Col_Crocs]

Its on their site. Youll see the new milspec with bigger photos and the older ones with thumbnail type pics.
Reading your threads, Im guessing the new milspec ones are all tested individually rather than by batch which I guess is what they used to do with the old ones.
My other question now is whether the gas port size has changed as well. Assuming what I have read in the past is true, that milspec barrels tend to have smaller gas ports?

[C4IGrant]

Originally Posted by Col_Crocs

Its on their site. Youll see the new milspec with bigger photos and the older ones with thumbnail type pics.
Reading your threads, Im guessing the new milspec ones are all tested individually rather than by batch which I guess is what they used to do with the old ones.
My other question now is whether the gas port size has changed as well. Assuming what I have read in the past is true, that milspec barrels tend to have smaller gas ports?

That is a lot of assuming without any proof.

Questions to ask barrel makers:

1. Which steel do you use? If it is any of the steel that is listed in MIL-B-11595E, ask to see the certs on it.

2. What testing do you do? Do you HPT and MP? Do you do EVERY barrel? What is their acceptance criteria?

3. What is the gas port size on their barrels?


As far as I can see on their website, there is no mention of the barrel steel and I see zero mention of high pressure testing.


C4

[Col_Crocs]

Thanks for pointing out those points.
I dont shoot that often and when I do, I let the barrel cool down between clips.

[skyugo]

Originally Posted by gotm4

For the vast majority (aka 99%) of people the barrel steel is fine with CMMG barrels. 10% of the people who think they need better than CMMG don't and the other 89% couldn't tell you the difference between CMMG and Colt/BCM or LMT nor why you would want the latter............YMMV.

I'm just sayin'

Sure I do wear out barrels about every 10-15K rounds with non-milspec steel, yada yada yada with my 3gun rifle. They headspace fine when I replace them but the throat is so far gone, that they shoot patterns instead of groups. It's not from the quality of the steel that I wear out barrels it is the way that I use them, 60 rounds though it in 45 seconds A LOT wears out the throat faster than 60 rounds in 45 minutes. The throat is gone and sure I could continue use of them for the vast majority of the 3gun shooting and training that I do (which is typically 150yds in and closer). When I replace a barrel on my 3gun rifle most of them will still keep a 3-4" group or slightly better at 100yds. BUT sometimes I shoot matches that include targets at 300yds+ so I want to be damn sure I can hit those targets making sure it's not a hardware problem if I miss that far out. I want to make sure it's a software problem and not a hardware problem and that it's the indian and not the arrow. As always YMMV.

that said, would it make more sense for you to go through a bunch of 250 dollar CMMG barrels or 600 dollar noveske barrels? ie does the noveske last twice as long?

if money isn't the point here, i fully understand that. just a question.

[Robb Jensen]

Originally Posted by skyugo

that said, would it make more sense for you to go through a bunch of 250 dollar CMMG barrels or 600 dollar noveske barrels? ie does the noveske last twice as long?

if money isn't the point here, i fully understand that. just a question.

All barrels will wear out quickly in the fashion that I shoot them in 3gun. I'm quite certain that a Noveske wouldn't last as long, actually it would probably wear out quicker in the throat area vs. a chrome lined barrel.

Noveske vs. a chrome lined CMMG is an apples vs. oranges comparison.
Noveske vs. a stainless CMMG/WOA/RRA/Lilja/Sabre would be apples to apples.

We'll see how long my new stainless 18" White Oak (WOA) SPR barrel will last, it cost me about $200 less than a 18" stainless Noveske SPR barrel and about $150 less than a Sabre Defence 18" stainless barrel.

[Remember911]

I have to say they have a new gimmic or copy of someones idea every other week. I say do somthing good and stick with it. No bells and whistle. That is what Savage arms learned back in the 80's. along with good CS. service.

[28_days]

Originally Posted by Col_Crocs

Its on their site. Youll see the new milspec with bigger photos and the older ones with thumbnail type pics.
Reading your threads, Im guessing the new milspec ones are all tested individually rather than by batch which I guess is what they used to do with the old ones.
My other question now is whether the gas port size has changed as well. Assuming what I have read in the past is true, that milspec barrels tend to have smaller gas ports?

Wait, so you're assuming that they've changed their products because of the word "new" and the larger pictures? The pictures haven't changed, they've just increased the size (you could always enlarge the old thumbnails). The descriptions are the same as well. I compared this against a print-out I have from a few months back.

Though feel free to determine if anything has changed (or Grant's criteria) if you give them a call. I for one would appreciate it.

[skyugo]

Originally Posted by gotm4

All barrels will wear out quickly in the fashion that I shoot them in 3gun. I'm quite certain that a Noveske wouldn't last as long, actually it would probably wear out quicker in the throat area vs. a chrome lined barrel.

Noveske vs. a chrome lined CMMG is an apples vs. oranges comparison.
Noveske vs. a stainless CMMG/WOA/RRA/Lilja/Sabre would be apples to apples.

We'll see how long my new stainless 18" White Oak (WOA) SPR barrel will last, it cost me about $200 less than a 18" stainless Noveske SPR barrel and about $150 less than a Sabre Defence 18" stainless barrel.

you notice quite a bit of difference in group size with the SS barrels vs. chromed?

over the rifle's lifespan i'd imagine chrome would hold a little tighter.

so how about noveske chromed vs. cmmg chromed?