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I saw where someone used a 3/32 roll pin for a bushing. What do you think?
If you are going to the trouble of taking down your gas block, have a real bushing in hand made from hardened steel to replace the existing one. There are many suppliers or pointers to supplier here on this site. If you buy only one size, get the 0.05" ID bushing.

While you are at it, order the kit with 0.045, 0.05 & 0.055" bushings so you can decide which one you want when you see what you have now. If you Mini has 40 foot ejection with 5.56 ammo like mine did, then you might like the 0.045" busing. If your Mini is ejecting only 25 or 30 feet, I would not go under 0.05".

You also need to consider what ammo you plan to shoot; if you go too small on the bushing, low powered ammo may make your Mini unreliable.

You may also want replacement screws that can be torqued evenly, as the stock ones are stacked in place and the thread damage can make things tricky. I went a step further and used a finishing tap to clean up the gas block treads and used an actual torque wrench in steps of 2 inch-lb...
 

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Discussion Starter · #3 ·
Thanks! Mine is throwing them about 18-20''. I was hoping a smaller bushing would help recoil and accuracy. It is a 580 with pencil barrel. Yesterday a friend came over with a DD AR and after shooting both, we could tell the mini had more recoil. My mini held it own at 100yards shooting horn any v-max.
 

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Subscriber is right, Quad. But, I do have the roll pin in one of mine and it does work to reduce the distance the brass flys. I went from 35' to 10-12 feet. Not perfect but the Mini operates with the lighter power ammo reliably. I prefer reliability to having the brass drop at my feet. I don't plan on changing it even though there are the reduced gas bushings out there. kwg
 

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I agree with the others, contact Gundoc ASI for a kit. I have a roll pin in one of mine too but it is set to shoot the hand loads I feed it. If your not reloading and feeding whatever is available, you want to keep your gun working with all ammo.
 

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Will the roll pin or the .05 gas bushing remove the dents I get in my brass? The Range Officer said the mini ejector spring is to strong and that is what is denting my brass. It currently is throwing @ 2:30 20+ feet. I have a 911 type buffer installed.
sorry no pics. dents about half way up cartridge.
 

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We all see the dents. I remember someone ground down the sharp corner of the Slide Handle where the brass hits. Not sure if that cured the dents or not though.
 

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The Mini's recoil system comes to you over-gased out of the factory to make it a reliable shooter with any ammo.

The thing is, from all the research I've done on this site about gas bushings in the past, the .050'' gas bushing will still eject everything.

So when I went for new gas bushings, I decided on the .050'', .048'' , and .046''
 

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3/32"??

I saw where someone used a 3/32 roll pin for a bushing. What do you think?
I think you should check the diameter of your bushing before as I believe you may discover the actual size is closer to 3/16" diameter.

A couple years ago, I posted where during a past lifetime, in drag racing, I had occasion to play with pills, no not that kind, that meter fuel flow like a jet in a carburetor.

It was determined that chamfer or change in finish of the hole does effect flow.
Now this is where the pressure is only 20 pounds or so. In a Mini, the gas bushing is under thousands of pounds of pressure. Any change should cause great variables where every day we see posts that different Mini's like different bushing sizes.

I made a variable gas block for my Mini and found metering was very touchy to adjust.
 

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if shooting from a bench for accuracy testing is a concern tap the gas pipe for a short set screw which effectively makes the mini a straight pull bolt action. tough to tap the pipe so use good quality tap and lots of lube if you try this. easily reversed.
saves the brass from dings too.
 

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Will the roll pin or the .05 gas bushing remove the dents I get in my brass? The Range Officer said the mini ejector spring is to strong and that is what is denting my brass. It currently is throwing @ 2:30 20+ feet. I have a 911 type buffer installed.
sorry no pics. dents about half way up cartridge.
Dents could be caused hitting the scope or charging handle.
 

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I saw where someone used a 3/32 roll pin for a bushing. What do you think?
I did the roll pin trick a while back. Best I can measure it came out at .046". The brass ejects at 6 to 8 feet now compared to 20. If you just want to tinker it's not hard to do and it will work, but as others have stated there are some good bushings out there to be had.
 
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