add in the way barrel is made HF vs. button ....hammer is better way to go ....the best way is NOT cheap !
|
||||||||||||||||||||||||||||||||||||||
add in the way barrel is made HF vs. button ....hammer is better way to go ....the best way is NOT cheap !
"It is well that the people of the nation do not understand our banking and monetary system, for if they did, I believe there would be a revolution before tomorrow morning." -- Henry Ford ! when a nation turns on it's own and denies it's own founding culture ,this is a sign of the death pangs of a nation --- cz7
In ARs, throat erosion will kill the bbl first. In which case nitrocarburizing is superior to chrome. I think at this point, chrome is little more than a vestige of an old manufacturing process. I can't think of a firearms related application where chrome would be prefered over many newer metal treatments.
This obsession over barrels is freaking unbelievable.
Barrels are consumables. Shoot them till they die and slam another on.
For all the amateur metallurgists and material scientists here: http://www.intechopen.com/books/heat...ment-of-metals
REALLY good tchit, Alpha!
extra info: earlier in this excellent thread, 'crystallization' had been mentioned. ALL steel that is below the melting point ['bout 2600°F] is a crystalline solid. period. It may be ferretic [all carbon steel such as 1006, 4130, 4150, and the 400-series stainlesses, like 410 & 416]; it could be austenetic [304, 316, 321 stainless], it could be partially martensetic. But ALL non-molten steel is crystalline.
![]()
Better? How? Less stresses in the barrel? Tighter dimensional control of bore dimensions?
Both. Evidence? Our military. Specifically, in the mid 70's Rock Island Armory extensively tested M14, M16, and M2 barrels made with Steyr process CHF against traditional methods and found significantly improved barrel life, dimensional accuracy, and smoothness.
Several euro mfg's and military users found the same, and still specify steyr process CHF.
Not really a surprise, the Germans invented CHF as a way to increase barrel life on the MG42. BTW, HHF and cold rotary swaging did not achieve the desired result, which was the more widespread mfg process prior.
CHF is THE way to produce a shitload of barrels QUICKLY. THAT is why the military loved it so much.
Yeah, they have had the shit cold worked out of them, which makes them pretty tough. It also makes them useless without a lot of stress relief (more $$). As far as your claims of surface quality and dimensional stability, they are entirely dependent on process control, just like they are in other methods of barrel making.
CHF was developed to churn out a large number of barrels quickly and economically, even with the added cost of stress relief. CHF isn't the only barrel making process that uses stress relief.
Ask Grant about the difference between the life of Colt CHF vs button rifled AR barrels.
INSIDE PLAN OF BOX
- ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
- MATCH SCRATCHES ON MATCH-BOX
- MATCH LIGHTS FUSE TO TNT
- BOOM!
- HA-HA!!
-WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"
I am American
Bookmarks