Why does the military spec 4150CMV?
Maybe they don't want to make the barrel smaller in diameter but only make a small diameter barrel stronger.
I read a report somewhere in the last few days that said in case of an obstruction IIRC the SCAR and HK416 barrel was fired it would not explode but a Colt barrel will.
As for personal experience, I have drilled apx 70,000 gas ports in barrels personally over a 14 year period. Barrels made of 4140 and then Melonite treated are easier to drill than 4150 barrels with the same treatment. The case hard created by the Melonite/nitride treatment is harder and thicker on the 4150cmv barrels which tells me the lands will not wear as fast.
I assume people buying barrels will decide if they want to purchase a 4140, 4150 or CHF barrel, chromelined or not based upon what they read on the internet LOL.
There is another professional forum made up of military insiders from several different countries, they discuss these topics in depth.
https://forums.delphiforums.com/autogun
Concern of rupture-https://apps.dtic.mil/sti/pdfs/ADA317929.pdf
another clip-"In fact, it is not even possible that an M4 barrel can heat up to the point of being white hot. M4 barrels are made from Alloy Steel 4150. The melting point of this steel is 1426 degrees Celsius. For steel to go white, it needs to be over 1400 degrees Celsius.
The Ground Precautionary Message ACALA #97-031, from November 1996, clearly states that if an M4 barrel reaches just 737 degrees Celcius, the barrel will be weaked to the point where burst."
"last longer" could mean different things, wear/accuracy or rupturing.
https://smallarmssolutions.com/home/...rearms-tell-us
Bookmarks