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I reload and the cleaning process ahead of reloading is a pain in the azz! Wish I would've known this at the time. That AR was a shooter....heavy, but shot great.
So it would require the charging handle to cycle a new round each time? That wouldn't be so bad I suppose.@Deersurgeon
Out of all the guys that I know who have ARs and run suppressors on them, NONE of them mentioned how the blow back gases trash the brass.
If you don't reload, it's a non-issue.
After going through the custom build of an AR-10, in 243, adding an adjustable gas block and finding out at the range how filthy the brass was afterwards....I sold it and went with a bolt action Savage Predator rifle, for coyote hunting. I explained all this to a guy at local gun shop, the Patriot Attic and there's a "by-pass" rod system (I forget what exactly he called it), that allows those gases to exhaust to a different port and keep the brass clean.
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It was annoying and I don't own a tumbler, so it was a matter of hand cleaning the brass before reloading. Also, the first 2 or 3 rounds in the magazine had to be cleaned after unloading. 
Pain in the azz!
Also sounds like extra pieces to break or be out of spec.....I just stopped by the Patriot Attic gun shop and asked about that gas system. It's called Direct Impingement. It's a rod that operates off of the gas block's gas relief and bypasses the blow back gas at the gas block, instead through the action itself. The rod acts like an interia recoil to operate the bolt carrier and the rest of the gases are vented off at the gas block.
This is entirely possible, but it's definitely some ballistic lab results/findings. I've never seen any signs of it, while reloading or shooting.
I replace brass cases, when I see cracks, bulges, etc. or any other signs of damage. 
I’ve shot some molys. Never saw a big improvement, but they were never worse than uncoatedThis is entirely possible, but it's definitely some ballistic lab results/findings. I've never seen any signs of it, while reloading or shooting.
I've been reloading since '77 and feel as though I can always learn something new, but I've never seen or heard of this happening.
While we're touching on the reloading subject:
I was introduced/shown this reloading method many years ago, but would've never considered using it. I've always ran mediocre loads, obtained good accuracy and was happy with the results.
Out of a reloading manual for 22-250, it stated that for a 55 gr. bullet 36.3 gr. was a Max. load with IMR-4064, at 3713 fps.
A hunting buddy with many more years of experience loaded 37 gr., seated the 55 gr. bullet and shot it into a sand pile, then inspected the brass case. Not showing any pressure, he loaded 38 gr., then 39 gr. and at 39 gr. the primer was flattened out, showing pressure signs.
He backed back down to 38. 5 gr. and there were no pressure signs with the primer. He then moly coated the bullet, loaded 3 rounds at 38.5 gr. and I shot them for a group, at 100 yards, on a bench on sand bags with a chronograph. The group results were 1 hole at 100 yards with a 3855 fps, 3 shot average. This same load shot 3 shots inside a dime at 200 yards.
I have never heard or would attempt this type of reloading, but it worked. His theory was the moly coated bullet lubricated the barrel/bullet and offered less friction, thus less pressure and produced more speed and increased accuracy. I don't know where he came up with this and I never asked. He proved it to me, once again with a Remington 788, in 308, while using IMR-3031 and a 110 gr. bullet. The end result was a touching "clover leaf" group at 100 yards and a 3040 fps 3 shot average.
To me it was more trouble than it was worth…. Messy….
