CMMG Barrels...

[Hawkeye]

What are your thoughts on CMMG barrels? I am considering one for a new build I have in mind.

[C4IGrant]

What are your thoughts on CMMG barrels? I am considering one for a new build I have in mind.

I think they are excellent, but would put would put them behind BCM's.



C4

[Lumpy196]

I think they are excellent, but would put would put them behind BCM's.



C4

Why is that?

[C4IGrant]

Why is that?

I am pretty sure that they don't use the same grade of steel and do not HPT their barrels.



C4

[Hawkeye]

They are supposed to be 4150 arent they?

[C4IGrant]

They are supposed to be 4150 arent they?

Not all 4150 is the same.

Here are some questions you should always ask a barrel maker:

1. What grade of steel is it (4140, 4150, etc)?
2. If it is 4150, does it comply with the MIL-B-11595E spec?
3. Do they HPT their barrels?
4. Do they MP test their barrels AFTER they HPT them?
5. Do they MP test EVERY barrel (not batches)?
6. Do they allow failures (meaning what is their exit criteria)?
7. Do they use M4 stamped barrel extensions (if your looking for that option)?
7. Do they park. under the FSB?
8. Is their FSB, F marked?

These are just some of the questions off the top of my head that I would use to compare one barrel to another.



C4

[VA_Dinger]

Based merely off watching Giff's group buy go down I would not touch a CMMG barrel. Right or wrong, I think they left Giff hanging out to dry for way too long.

[K.L. Davis]

Not all 4150 is the same.

Here are some questions you should always ask a barrel maker:

1. What grade of steel is it (4140, 4150, etc)?
2. If it is 4150, does it comply with the MIL-B-11595E spec?
3. Do they HPT their barrels?
4. Do they MP test their barrels AFTER they HPT them?
5. Do they MP test EVERY barrel (not batches)?
6. Do they allow failures (meaning what is their exit criteria)?
7. Do they use M4 stamped barrel extensions (if your looking for that option)?
7. Do they phosphate under the FSB?
8. Is their FSB, F marked?

These are just some of the questions off the top of my head that I would use to compare one barrel to another.



C4

According to their website, they do most of the above... but, given the lack of quality I have seen with their recent barrels -- or at least poor quality control -- I wouldn't touch one. There are much better choices for a new barrel.

[Edm]

I have a CMMG Midlength upper that I bought before BCM released theirs. It is my most accurate barrel. I compare this to two RRA and a Bushmaster. So thats not a huge sample but what I have. I got on ARF after the whole Gif thing so I don't know anything about that. The guys at CMMG were great dealing with me on the phone. I am a casual shooter and am not in the service anymore, however I still like to buy the best quality equipment I can afford. I am Very happy with my barrel. It works great for me.I'll probably end up with a BCM barrel someday but would have no hesitation about buying another CMMG either.

[M4arc]

I have a 14.5" CMMG upper that has about 8500 rounds through it now and it has been 100% reliable and accurate.