A catchy old saw, but I have yet to hear from serious users thereof that think it’s a problem. Keep it clean - which you’ll have time for before the issue arises - and apparently it’s well-liked in the field.
Never had a carbon-related failure in any of my issued or personal weapons. It’s a non-starter.
It’s not just a catchy old saw. It’s the truth. 1960’s direct blowback technology is just stupid when HK, LWRC, FN, etc all have piston driven operating rod systems that are far superior.
And trust me, it’s NOT well liked in the field. In the middle of a firefight, in dusty conditions like in Iraq and Afghanistan, you don’t have time to sit down and do a nice little cleaning.
For $400 a piece HK will sell upper receivers for the M4 based on the HK 416 (a damn fine weapon) that will fit all of them NOW.
I don’t know of anyone that would argue a direct blowback system is superior to a piston driven one. People only argue that it’s “good enough”. Not better.
Well why the hell are we staking our troops’ lives in the field on something that is second best and not the best?
Why would Delta switch to the HK 416 instead of the M4? And if you don’t like buying from the Germans, LWRC makes a very nice system as well.
My nephew did 15 months in Iraq. He liked the range and accuracy of his M16, but didn't like that his rifle could not shoot through a wall and theirs could.