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I am beginning a build. So far, I have a stripped lower and a CMC trigger group. I can get a mil-spec extension and all the detents, springs and such but beyond that, I need to make foundational decisions...lol.

Gas system will decide buffer and narrow down barrels...then feedramps or lack thereof on the barrel will dictate uppers to a certain extent.

I have pretty much decided that I am going carbine length on the gas system as losing two inches on the gas system is supposed to increase felt recoil slightly...but I am shortening the barrel by two inches also over the M16 I used in the service. My thinking is felt recoil on a 5.56 isn't significant anyway do a minor difference isn't a big deal.

Now all this is just my thinking but I haven't fired or worked with this platform in 20 years...lol.

My question now is that I get diehards on both sides of the coin as to chrome lined barrel over a melonite treated. It's almost akin to the glock/1911 debate...lol.

What say y'all?

And if I am way offbase as to carbine vs mid, let me know and why.

This will be just a general purpose gun.

Our M16s were wore-out, used and abused along side being 15 years old at the time and I still never missed the black at 500 on the B-mod targets. A new rifle assembled of quality parts should get in the same neighborhood even with only 16" worth of barrel and a carbine gas system. Am I off base? I am not expecting 2 inch groups at 500 but it should perform ok I think.

i think this is one of those questions where you will continue to get different answers. myself i have a couple that are nitride and i have no issues with them and have put 1k's of rounds through them and they are very accurate. some people say go chrome or go home others say nitride/melonite are more accurate and last longer. actually myself i dont think you will probably find any fault either way you go


http://www.cobratacsystems.com/blogs/ne ... comparison" onclick="window.open(this.href);return false;

I just bought 2 complete 16" uppers for builds I'm about to do with my grand kids. They are Chrome Moly Vanadium Nitride treated.

Obviously I haven't shot them yet, but I have looked them over closely and everything looks very good. They have full auto bolt carriers with properly staked gas keys, just to name a couple of things.

They were a good value at $319 each. The shipping was reasonable and very fast!

http://fatboytactical.net/index.php?mai ... =1&sort=3a

Pawpaw wrote:I just bought 2 complete 16" uppers for builds I'm about to do with my grand kids. They are Chrome Moly Vanadium Nitride treated.

Obviously I haven't shot them yet, but I have looked them over closely and everything looks very good. They have full auto bolt carriers with properly staked gas keys, just to name a couple of things.

They were a good value at $319 each. The shipping was reasonable and very fast!

http://fatboytactical.net/index.php?mai ... =1&sort=3a

I don't know if I can buy anything from 'Fatboy Tactical'...lol...might have to do a self evaluation.

I do like those prices but they don't have very comprehensive data on their barrels...what are the gs port sizes? what is the diameter at the gas block? who makes their barrels?

Just in case y'all are interested, my brother-in-law sent me a link to this thread...

http://www.m4carbine.net/showthread.php?756-Barrels-101

Makes for some interesting reading.