Dirty gun

[Lo8080]

I shot my AR this week, first time with a can and I noticed that the carbon buildup was much greater than before. Im not sure if it was different ammo that I was shooting American Eagle but likely not the reason. I clean all my firearms after every session. Some may say too much CLP as I am pretty liberal with the stuff. Today I had one round that would not feed initially. Is this common with suppressors?

 

[GunnyUSMC]

Basically an AR pucks inside it’s self = direct impingement. When you add a supper more gas is forced back into the action = gun gets dirtier faster.
Cut back on your lube.

 

[MachIVshooter]

Yes, it's normal. Any suppressed autoloading firearm is gonna be far dirtier than unsuppressed. And the gas system in the AR hasn't a thing to do with it; all the crap comes back through the bore. The orange followers in my S&W 4516 mags are grey-black after just a few mags.

Advantage to the AR: The Stoner gas system, which is not direct impingement, provides for less port noise than any short or long stroke op rod system. It is one of the quiestest semi-autos suppressed. Many rifles aren't hearing safe regardless of suppressor due to the port noise.

Action type & Effects on SPL

Suppressed sound levels referenced to an M4 Carbine
(M855 ball ammunition, 14.5”
barrel, same suppressor)

HK 416 5 dB louder
SIG 551 14 dB louder
Steyr AUG 9 dB louder
Bolt action Same (however, barrel was 20”)
AR-15 2 dB quieter (20” barrel)

I believe this is measured at the shooters ear, rather than 3' to the side of the muzzle.