Ball Milling - Barrel Dimpling - AR-15

Most any machine shops can do this, if you explain or give a drawing. It's a very simple process, just requires time to do it. Expect it to be in the $500 range for a one off job.

-Former tool and die maker.
 
I know there are a number of different barrels on the MRPs...I am not super up to date on what processes and materials they've used so obviously this is just general advice, I'm not claiming one or the other applies here specifically.



If it's stainless then I think this process would be fairly expensive.

If it's chrome/moly then I think this process would be really expensive as it'll also have to be refinished afterwards.

If it's melonited/nitrocarburized etc then I think you're pretty much ####ed.


Hopefully it's one of the stainless ones!
 
I'd put stainless and chrome molybdenum about the same. Although you don't have to refinish the stainless, it will be murder on tools. Especially plunging with a ball mill.
 
I don't think the difference between 416R barrel steel and 4150 barrel steel would be all that great. In my experience with these two steels, they machine pretty well the same, and the 416R is actually somewhat easier to machine. Regardless the dimpling process would be very time consuming and incredibly costly for a one off.
 
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