Any advantage over CL?
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Melonite (which goes by many names) penetrates the metal and should last longer than chrome, slow down erosion (GP, etc) and increase FPS.
With that said, if the barrel is NOT either polished or shot BEFORE melonite, you can basically make the burrs in the barrel pretty permanent (where as they would normally be removed or covered with chrome or shooting).
We just had two BCM SS barrels done. I will be testing some theories soon. If I am right, you could basically get the accuracy of a SS barrel without any of the wear issues normally associated with SS barrels.
C4
Very cool. I assume you'll be getting the low down on their mfg process? I'd be down for an upper, granted it's done right. Not too interested in the magpul lower, atp.
Not really. "Break in" is what some do like worshipping pig blood cleaning after each round for 50 rounds or so. Shooting a barrel is best or hand lapping. Barrels usually shoot in meaning the shoot their very best groups say in the barrels life after 500 rounds but before 2000 rounds. Just like like the cylinders in an engine, they seal best after the first 3000 miles or so. Doesn't mean you need to worship a goat over them and change oil every 100 miles.