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I bought my 580 Mini about 2 1/2 years ago. Cleaned it new, and I've ran about 350 rounds through it. I decided to clean it today, and I have some questions.
-What do I need to clean the chamber? I bought a .38-.357 brush that I thought would be close, and it isn't right.
-How do you take out the gas bushing to clean it, and how do you clean the gas ports in the barrel?
-Should the gas bushing be loose in it's mounting? Apparently it leaks for all of the fouling found on the inside of the gas block.
-When I squirted carburetor cleaner in the barrel, it leaked around the base of the gas bushing and out of the gas block and ran down the outside of the barrel. Should it be doing that?

Other than those things it went ok, except for it being a bitch to get the bolt back in the reciever. Any thoughts/comments/advice from those of you with a lot more Mini experience than me would be greatly appreciated.

Steve
 

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-What do I need to clean the chamber? I bought a .38-.357 brush that I thought would be close, and it isn't right.
I use an M-14 chamber brush. I know it's for a .308 chamber, and a bit too big, but it really gets the carbon cleaned-out. One brush will typically last me 5 or 6 chamber cleanings.

-How do you take out the gas bushing to clean it, and how do you clean the gas ports in the barrel?
It is pretty much self-cleaning. If you wanted to clean it, you would need to remove the gas block. It's a pain to remove (the screws are staked in place at the factory), but it's a good idea to remove it once and re-torque the screws. This will sometimes improve accuracy.

-Should the gas bushing be loose in it's mounting? Apparently it leaks for all of the fouling found on the inside of the gas block.
Yes.

-When I squirted carburetor cleaner in the barrel, it leaked around the base of the gas bushing and out of the gas block and ran down the outside of the barrel. Should it be doing that?
Yes.

Ok I thought about it, and the fouling inside the gas block isn't from the bushing leaking, it's just the way it works, right?
Yes.
 

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I took an aluminum cleaning rod and bent at a 90 deg angle to use the pistol brush with. Loosening the gas block screws and tightening back with equal torque usually gives some gain in accuracy. It may shift the point of impact on the target also.
I have even taken the gas block halves off and sand the surfaces true with emery cloth and wood dowel. You want the best fit to prevent leaks, a lot of minis are sold without the gas block close to having even torqued screws. The halves will be gapped big on one side and almost touching on the other. ;)
 

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I bought my 580 Mini about 2 1/2 years ago. Cleaned it new, and I've ran about 350 rounds through it. I decided to clean it today, and I have some questions.
-What do I need to clean the chamber? I bought a .38-.357 brush that I thought would be close, and it isn't right. -How do you take out the gas bushing to clean it, and how do you clean the gas ports in the barrel?
-Should the gas bushing be loose in it's mounting? Apparently it leaks for all of the fouling found on the inside of the gas block.
-When I squirted carburetor cleaner in the barrel, it leaked around the base of the gas bushing and out of the gas block and ran down the outside of the barrel. Should it be doing that?

Other than those things it went ok, except for it being a bitch to get the bolt back in the reciever. Any thoughts/comments/advice from those of you with a lot more Mini experience than me would be greatly appreciated.

Steve
I would recommend getting an M16 chamber brush for it. You should be able to find a complete M 16 ceaning kit at a military surplus dealer or in shotgun news ads (or gunbroker.com)
 
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