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8/21/2016 12:19:41 AM EDT
I put together an AR pistol a few moons ago, and gave it a rustoleum camo job. Unfortunately I didn't bother to test whether or not empty or half full mags will drop free prior to painting it, so I have no "control" to reference. But the painted version is not dropping free. So far I've tried using scotch brite purple scour pads to rub off the paint that got inside the magwell, but its still not enough. Also tried coaing the top of a mag in valve grinding compound and inserting and removing it over and over which seems to have done more wear to the magazine than the lower. I do have a dremel but no polishing wheels or polishing compound.


Anyone got any ideas?

its a CMMG forged (I think?) lower & USGI mags, no magpul or anything else
8/21/2016 12:47:40 AM EDT
[#1]
Chemically strip the paint inside the magwell? It shouldn't hurt the anodizing one bit.

I've got no experience removing rust oleum but I just got done removing both Duracoat (with Jasco's) and Alumahyde II (with citrustrip). Acetone should work well for regular spray paint I would think.

CMMG makes quality guns and lowers. I'm betting it's the paint. Remove it and check again. It doesn't take much to make a magwell 'tight'.
8/21/2016 1:11:13 AM EDT
[#2]
I had a CMMG lower that was out of spec and would not allow magazines to drop free.  I tried the mags in other lowers and they dropped, so I eliminated it being the magazine.  CMMG replaced my lower.
8/21/2016 1:14:41 AM EDT
[#3]
Call CMMG. Unless you sprayed a bunch of paint in the mag well.
8/21/2016 1:30:01 AM EDT
[#4]
Quote History
Quoted:
I had a CMMG lower that was out of spec and would not allow magazines to drop free.  I tried the mags in other lowers and they dropped, so I eliminated it being the magazine.  CMMG replaced my lower.
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I recall CMMG sold several of out of spec lowers a few years ago.
8/21/2016 1:56:16 AM EDT
[#5]
Quote History
Quoted:


I recall CMMG sold several of out of spec lowers a few years ago.
View Quote View All Quotes
View All Quotes
Quote History
Quoted:
Quoted:
I had a CMMG lower that was out of spec and would not allow magazines to drop free.  I tried the mags in other lowers and they dropped, so I eliminated it being the magazine.  CMMG replaced my lower.


I recall CMMG sold several of out of spec lowers a few years ago.


Consider my memory jogged! Yes, they did have some out of spec lowers go out...I'd still try to remove the paint first and then contact them if you're having issues still though.
8/21/2016 2:00:45 AM EDT
[#6]
Paint stripper will knock spray paint right off. Strong carburetor cleaner will as well. Get it clean and that will tell the tale.
8/21/2016 4:04:48 AM EDT
[#7]
Chances are it's the lower /magwell out of spec.   Brake parts cleaner , a tooth brush, and elbow grease will remove the paint inside the magwell
8/21/2016 4:58:30 AM EDT
[#8]
I emailed CMMG to see what they have to say about it.  Also gonna try to see if I can get some aircraft remover (paint stripper) in the magwell without getting it on the rest of the lower.. I like the paint job I gave it.
8/21/2016 12:57:06 PM EDT
[#9]
Turns out that loosening the mag catch/release fixed the problem.

8/22/2016 9:38:05 PM EDT
[#10]
Quote History
Quoted:
Turns out that loosening the mag catch/release fixed the problem.

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