 chead 
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Joined: Apr 2012  CA, USA
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Posted: 4/20/2012 3:05:16 PM
THE IMAGE ABOVE IS A PAID ADVERTISEMENT I can't tell what it is, it looks like sand, but I cleaned it thoroughly before the range trip. It's hard to tell, but it looks like it's shiny when I wipe it down. Could it be bits of casings or primers? Maybe friction from the new bolt and hammer is wearing this off and blowing it back into the lower? It doesn't seem to be getting into the chamber, which I'm mostly concerned about. I definitely don't want grit getting through the bore. Here's a picture (click for big): 
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a308garand
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Posted: 4/20/2012 3:17:52 PM
Gunpowder residue. There is an amount of junk expelled from the chamber during firing, unburned gunpowder, brass shavings, etc. Normal for what you have described.
The 9mm has a large "bump" near the rear of the ejection port to direct some of this blast and residue from hitting you in the face  |
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Posted: 4/20/2012 4:13:06 PM
Originally Posted By a308garand:
Gunpowder residue. There is an amount of junk expelled from the chamber during firing, unburned gunpowder, brass shavings, etc. Normal for what you have described. The 9mm has a large "bump" near the rear of the ejection port to direct some of this blast and residue from hitting you in the face Nice, thanks! I didn't realize that much would be blowing back. I'm glad the deflector is there :) |
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Posted: 4/20/2012 4:13:36 PM
[Last Edit: 4/20/2012 4:14:42 PM by TACCOM3G]
That is what you get with blow back actions. And the sooner the bolt comes back, the more crud you get.
This is also very typical with the 22LR uppers too. The good news is that if you have a compressor....it just blows out, the bad news is if you don't have compressor, it takes a little more time to clean up. Shot in the dark sometime......you might even see flames coming out the ejection port . Tim |
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Redtazdog
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Posted: 4/21/2012 4:33:12 AM
I dont get as much blow back in the action with a heavy buffer, the lighter weight buffers will allow the bolt to come back sooner
and then you get more chit in the action. |
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SpecOps-13
Weapon Systems Test and Evaluation,
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Joined: Apr 2007 FL, USA
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Posted: 4/21/2012 8:30:57 AM
[Last Edit: 4/21/2012 8:32:15 AM by SpecOps-13]
I keep canned air, keyboard/computer cleaner handy to blow the majority of that crap out when cleaning.
Most of the factory pistol caliber ammo has gone to some really dirty powder to cut manufacturing cost. I shoot DI45's / Win Mags and some ammo now even has plated or washed bullets. Some of that ends up in the gas systems. Handloads with jacketed bullets and Unique Powder seems to keep things a bit cleaner.. Dave S |
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Greg3
Screw it, I'm going shooting!
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Joined: Nov 2000 KY, USA
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Posted: 4/21/2012 7:16:46 PM
That pic takes me back when I had the R0635 subgun upper on my RR. Hell of a mess but fun as hell!
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Posted: 4/21/2012 9:33:41 PM
What !!!
An AR owner that doesn't have a case of spray brake cleaner on hand. 
Try it, you'll like it. Just don't get any in your eyes.  
Jack...  |
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uncleboomboom
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Posted: 4/22/2012 11:26:53 AM
If you think that's bad, you should see all the crud that accumulates with a suppressor attached!
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Posted: 4/24/2012 2:24:14 PM
Originally Posted By uncleboomboom:
If you think that's bad, you should see all the crud that accumulates with a suppressor attached! http://i585.photobucket.com/albums/ss291/uncleboomboom/AR15/AR_9mm.jpg Wish I could, but.. California :( |
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Posted: 4/24/2012 4:12:56 PM
Originally Posted By TACCOM3G:
The good news is that if you have a compressor....it just blows out, the bad news is if you don't have compressor, it takes a little more time to clean up. Tim After seeing a buddy's setup, I ran a line from the compressor in the garage to my shop. I've used the airgun for everything from gun cleaning to puppy discipline (no animals were hurt in this process, but the pooch really doesn't like the sound...)and it really is a handy thing to have. It makes cleaning blowback lowers a snap. Moon |
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Ben762
Geology Undergrad
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Posted: 4/25/2012 5:35:05 PM
Originally Posted By TACCOM3G:
This is also very typical with the 22LR uppers too. Yup, my .22 is downright gritty after a box of ammo. |
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Posted: 4/26/2012 1:04:00 AM
It is gunpowder residue but it looks like incompletely burned powder vs the normal carbon build up you get with the 9s. Try a different load to see if it does any better. You also may want to look at a heavier spring and maybe a heavier buffer.
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yekimak
Dirt doesn't need luck.
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Posted: 4/26/2012 1:19:04 AM
Originally Posted By uncleboomboom:
If you think that's bad, you should see all the crud that accumulates with a suppressor attached! http://i585.photobucket.com/albums/ss291/uncleboomboom/AR15/AR_9mm.jpg 
It gets pretty bad after a while. |
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Posted: 4/26/2012 6:07:34 AM
I've never seen it that bad in any of my rifles. .22 conversion kit or not.
But the brake cleaner does wonders. I only clean my lowers with brake cleaner every 3 or 4 range trips but the uppers/bolt/barrel get cleaned every trip. |
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