hey m4c people,
need some help from u experts out there. i recently installed an aac m4-2000 on my 10.5" sbr ar-15. i have shot less than 400 rds out of my current setup. less than 600 rds on the upper in total. i have noticed that there is a type of fouling gathering inside the upper receiver that i have never seen before. this fouling does not appear to be the same as the traditional carbon or copper fouling that i have seen in the last 20 yrs of shooting. this fouling is a grey color, appears to have dried as a liquid. it seems to stick to the receiver like paint, but does not respond to hoppes no.9 or brake parts cleaner. in order to remove this fouling, it must be scraped off or scrubbed off with a metal bristled brush.
i have included in this thread, some pictures of what im talking about. ignore the brown liquid, that is hoppes. pay specific attention to the grey parts. the receiver is black. when i bought the suppressor, i knew that the suppressor will increase the amount of fouling and will make the gun dirtier, but is this what happens to all suppressed guns? im kinda stumped here. this is my first suppressor. first time using this particular type of lube, but i have had many rifles in the past. this crap just does not come off unless scraped. im convinced that this can not be normal. any help or ideas will be very much appreciated. thanks in advance.
richie
this is the only lube i have used on this gun.
could this stuff be residue from the lubricant? i dont see how but i have no other ideas on what it could be.
dry film lube? it doesnt say that on the can. i just figured that it was gun oil like any other gun oil i have used in the past. i have never heard of dry film lube. i must have been living under a rock or something. so how do i get that crap out of the inside of the receiver?
i bought this upper receiver brand new, unfired. it did not have a grey film inside it before i fired it. how could it have gotten there? no one else has ever had this gun but me.
The dry film lube is put in by the manufacturer, it is supposed to be there. It is an extra layer of lubrication.
It may not have been noticeable when you first got the upper but it did not come out of your Rem-oil.
my first choice would have been to use the same stuff that the marine corps issues because i know how well it works. my question now is, where is it commercially available?
Oh, I’m no spert…just going by what I read & going from there. I couldn’t imagine any lube being so hard it needed a wire bruch or a dental pick to remove?? It almost looked like JB weld.
So are you saying this stuff was not there before you stated using the can. I was / am having a tough time trying to imagine what could turn into that sort of goop from just using remoil.
honestly, i thought the same thing, although not as hard as jb weld, but damned close. i have no idea whats going with this. im not quite convinced that its that dry film lube stuff. although, im no expert either. i dont doubt that the other guys posting are very knowledgeable, it just doesnt sit right with me. i dont know, maybe i will just try to scrub out what i can, and use a different lube and see if that changes things. she still shoots great. makes great groups, but the grey stuff still bothers me. thanks to everyone for offering some info on what could be causing this. i really appreciate how well this site seems to know so much and that the members are awesome. again, thanks.
For oil/lube I’d recommend Militec-1, Slip2000 EWL, Machinegunners lube/10-8 lube and WeaponShield. I find in suppressed guns WeaponShield burns off the slowest.
