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Installed 1911 recoil bushing on the back end. Gundoc's medium gas block bushing. Shooting medium hot loads (24 gr. IMR 4895 CCI primers and Sierra 65 gr. Gamekings).
At end of the magazine last round, the bolt failed to lock back on numerous occasions.
Any advice?
 

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Take out the buffer and give it a try. Or try some factory ammo and see if it will lock. Sometimes going with a reduced gas bushing and a recoil bushing will cause just what you have happening + the reloads that may be a bit underpowered.

I just went with a 1911 buffer at the receiver and have not had any problems with any ammo I have shot and my bolt will lock back on the last round. It still flings the brass but I would rather have to go into the next area code to pick it up then have a rifle that might not be reliable when I might need it the most.
 

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^What he said.

You might be able to get away with sanding the buffer down a hair. Lay a piece of sandpaper on a smooth, flat table and run the face of the buffer across it. Remove a few thousandths, reinstall, and try again.

I have Wilson Shok-Buffs installed front and rear on my Mini, and wouldn't trade them for anything. But, my rifle functions with them in place in conjunction with a .050" gas port bushing, too. ;)
 

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Installed 1911 recoil bushing on the back end. Gundoc's medium gas block bushing. Shooting medium hot loads (24 gr. IMR 4895 CCI primers and Sierra 65 gr. Gamekings).
At end of the magazine last round, the bolt failed to lock back on numerous occasions.
Any advice?
I have found 24 grains of 4895 to be a minimum round. With 55's and 60's in my Mini's they are hit and miss locking the bolt back. The good thing is only .2 more of a grain seems to be the fix. I doubt the 1911 bushing at the receiver end is a real problem but you can take it out to elimiate a variable.

Also keep in mind 4895 does not meter as well as ball powder. You may be getting some loads lighter than others. I like AA2230 and 2460 in my Mini's. kwg
 

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I have found 24 grains of 4895 to be a minimum round. With 55's and 60's in my Mini's they are hit and miss locking the bolt back. The good thing is only .2 more of a grain seems to be the fix. I doubt the 1911 bushing at the receiver end is a real problem but you can take it out to elimiate a variable.

Also keep in mind 4895 does not meter as well as ball powder. You may be getting some loads lighter than others. I like AA2230 and 2460 in my Mini's. kwg
^^This
 

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Take your rifle out of the stock.

Make sure it's empty.

Now, note where your magazine pushes up on the hold open tab/lever on the action.

See how the bolt has to come back, and allow the mag to push it up/out and hold the bolt open?

Now, look at how that rear buffer can, if it's TOO THICK will not allow the bolt back enough to get the hold open to flip into place, and lock the bolt back/open on last round.

What I've found is the 1911 buffers are TOO THICK, and at over a 1.00 each are way over priced, don't hold up well in my Mini 30, and when I discovered that high pressure Earl's blue hose works, I'm never going back to expensive 1911 buffers.

I suppose any high pressure fuel hose would work. I use Earl's blue silicone hose that is designed for push lock fittings, or can be clamped in place on other fittings.

You need a sharp knife, cutting board, or in my case, Craftsman cutters that have a razor on one side, and a cutting flat spot on the other.

I cut the hose about 1/8" thick or LESS. (Thick very thin washer type cuts, not so much doughnuts.) experiment with this on both sides, at the gas port, and the spring rod/action where the bolt come back, and slams into the action. These thin cut washers/buffers work excellent.

In my case, the 1.00 each 1911 type buffers crush up, crack and fall apart in less than 500 rounds.

While the "earls hose" buffers are much more durable, and have not needed to be replaced yet, going on 1500 rounds. But they do show signs of wear, but I have a zip lock baggie of them ready to go in various thicknesses cut out of scrap hose.

Cheap, and effective.

I should package them for .50 cents each, and run the 1911 guys out of business... :)
 
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