This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.
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Great info, thank you.
Is there any indication of the barrel steel / barrel life for the MK556 vs the H&K416?
Barrels being the major part that wears out first, it would seem that would have been a consideration for overall service life cost. And the 416 is known to have a very long barrel life.
There are other people who make barrels with that same steel though. HK definitely does not have a lock on that particular thing.
Do you know which other companies are using the same 'HK Steel?"
I seem to recall the steel was French?
I don't have that information offhand but iirc it's an aermet derivative steel and there's people doing high end CHF barrels using it here stateside.
I'll look at my notes
Aubert & Duval is the supplier. I can't share the exact alloy, but it's a ChroMoVan steel.
The typical German military barrel steel alloy is 32 CrMoV 12 10 and indeed I have seen batches from French steel mills.
Guess I can post this now, then.
Thanks guys, very helpful.
Do either of you know the H&K RC heat treatment?
I seem to recall that the standard US 4150 was RC 32-34, whereas the H&K was RC 42-46?
I'm a pocket knife nerd originally, prior to getting into guns. Thats an area where steel and RC harnesses are both tremendously important to overall edge retention.
So I imagine that using a harder RC treatment would also factor into overall 'rifling retention.'
For example, a typical bayonet is 51-53RC vs 59-61 for a modern, high end pocket knife. That doesnt seem like much of a spread, but theres a huge difference in overall edge retention. Even the difference between 57 and 60rc is noticeable on a pocket knife.
I'm still not in the clear of why they decided to go with Haenel's AR aside from the rumors(?) that it's supposed to be a cheaper alt. of the 416.
I thought the bundeswehr have already fond of their 416. And The 433 might be more pricey but it got a lot of new features and improvements from the G36. Did H&K messed up in the run somewhere? or did the Haenel and Caracal just have a more powerful political power?