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purehavoc 05-16-2013 01:58 AM

cryogenic treatment to bolts and barrels
I bought a couple of shady bcgs and there are zero specs out there on the "R Guns " but they were cheap and available and I needed 2 to finish builds . I found a place local that does cryogenic treatment on everything from engine parts, ball bats to gun parts .Im just thinking cryo treatment may help the longevity of the unknown bolt material .
Anyone else have a good response or experience with cryo treatments ?

pawjr74 05-16-2013 02:04 AM

No experience but would the cost be worth it?

purehavoc 05-16-2013 02:17 AM

Not sure . Im waiting on a price to come back to me . If its $20 for the bolt I would say yes if its going to cost $100 then no

JonM 05-16-2013 03:28 AM

you would get more usefulness out of having it shot peened than cryo'd. cryoing is typically done to barrels to relieve the stresses put on the metal by the rifling proccess. its one of the reasons RRA ar15 are so damn accurate. they use wilson cryoed barrels in most of their builds. wilson makes a barrel thats hard to beat or even match. i would put em right up there with whiteoak or krieger in some respects.

there just isnt enough metal in a AR15 bolt nor has it been machined in such a way to produce those types of stress that would effect its life span. surface hardening via shot peen is a much more effective method of strengthening it. its one of the reasons bcm bolts are sought after so hard.

Triumphman 05-16-2013 03:09 PM

From what I understand about R-Guns from another Forum, is that they're using 8620 Steel because it's easier to get, instead of the (now) recommended C-158 Steel. Heard that lots of the (better) Manufacturer's were having hard time getting C158 Steel, and that's why you're seeing "out of the woodwork" cheaper BCG's on the market.

Considering this, how would Cryo help? I know it changes the molecular structure, but every break I've seen on a Bolt is at the Lugs which is the weakest link. Good Steel or Bad, if it's a weak link anyway, where would the savings be?

Quentin 05-16-2013 04:36 PM

I'm also of the opinion that it's not worth it. We are starting to see quality BCGs for sale more often these days. Maybe those bolts can end up in a low cost, light use build? Or can be sold with full disclosure - there are a lot of folks who still want something, anything to drop in their never to be used AR.

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