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Bolt not locking back on empty Mag

This is a discussion on Bolt not locking back on empty Mag within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; Hello, I got a new to me 581 series mini. I haven't had a chance to shoot it yet but I did load a mag ...


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Old April 13th, 2017, 07:27 PM   #1
 
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Bolt not locking back on empty Mag

Hello,
I got a new to me 581 series mini. I haven't had a chance to shoot it yet but I did load a mag and cycle 5 through it by hand to make sure everything functioned ok (just fyi this was done is a safe manner). I noticed about every other round would not hit the ejector seemed like they skip over it. Is this normal for a mini, I no my 1911 will sometimes let cases slip over when cycled by hand, but it runs 100% while firing.

I also noticed the bolt barley locks to the rear, if I were to shake the rifle the bolt would go home on a empty mag. I figure that if it does this it probably won't lock open when firing. This is a 20 round factory mag. I figure this is a mag issue but thought it may also be a ejector/hold open issue.

Any advice from the experts?



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Old April 13th, 2017, 11:25 PM   #2
 
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How many rounds have been shot through this rifle?
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Old April 14th, 2017, 10:15 AM   #3
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Scooter, check the back end of the follower on your Ruger mag. It should have a finger sticking up on the left side. The follower is plastic and it is always possible it is worn down enough to not work properly. That little finger is what engages the bolt-hold-open feature.

You may also want to lock the bolt to the rear with no mag in and see if it keeps open with the same shaking you did earlier. If it holds, then it is probably the finger on the mag.

You may also want to check and see if the previous owner put a buffer at the receiver-end of the op rod (a popular option - I use them) as some Minis don't fare well with a particularly thick buffer. That would keep the bolt fully going to the rear - which would cause problems - to include ejecting.

The Mini cycles pretty violently, and your hand-cycling should be equally violent.

That's about all I can offer - other than taking it out and firing it to see if the problems are only with hand-cycling.

Hope this helps.
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Old April 14th, 2017, 06:23 PM   #4
 
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Thanks, this has been helpful.
I hope to shoot it soon and see, I am waiting on a sight screw.
after further looking, I believe it is a mag issue. The finger on the mag is present and doesn't seem to be worn, however i can lock the bolt with out the mag just fine and if i manually hold the bolt back and push up on the bottom of the mag it will lock just fine as well. I also cycled rather really hard and fast and it ejected fine, could get it to do it but a few times tho, but with that I figure that it should be fine in actual firing
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Old April 15th, 2017, 05:33 AM   #5
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Scooter, make sure the trigger housing is fully seated. Sometimes, what you describe is from a trigger housing not fully seated/locked in place.
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Old April 15th, 2017, 11:30 AM   #6
 
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I took the trigger and receiver out of the stock and locked them together put the empty mag in and it locked open fine. I put the parts back in the stock, locked everything together and it was the same as before hold open was barley engaged. the trigger guard is fully locked in to place as confirmed by a loud click. I have also noticed that the stock endcap will not seat flush with the gas block, is this related to the issue?
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Old April 15th, 2017, 11:43 AM   #7
 
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Quote:
Originally Posted by firescout View Post
How many rounds have been shot through this rifle?
What I'm getting at is that the rifle may not be completely 'broken in' yet. It seems like it takes at least several hundred rounds through a newer Mini to wear-in and burnish the moving/sliding parts. Your rifle's bolt may be encountering excessive friction toward the end of its rearward travel into the receiver.
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Old April 15th, 2017, 11:48 AM   #8
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Scooter, could be. What type of stock is it? (Ruger factory wood, Ruger factory synthetic, or aftermarket?).

My stock endcaps have a little space between them and the gas block - perhaps 1/16" (that is with both a 1977-vintage 181-series and a current 583-series). That is normal. The fact that the bolt-hold-open works with the mag outside of the stock but not with the stock sort of narrows things down a bit. Check for binding in the stock's mag well.
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Old April 15th, 2017, 12:13 PM   #9
 
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Factory synthetic, its not binding. I looked at the gap between the trigger housing and receiver that is visible in the mag well right above the mag release. it seems the gap is bigger in the stock than when i put them together out of the stock. which would make sense because the mag would look a few thousandths lower in the stock causing the follower not to push up as far.
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Old April 15th, 2017, 12:59 PM   #10
 
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I am going to try another mag just to see, if not does anyone have an idea if ruger would fix it under warranty?
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Old April 15th, 2017, 06:29 PM   #11
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Scooter, call Ruger CS, they might have a solution short of sending your entire rifle in. They're pretty good about fixing things regardless.

Ruger will make it well. Warranty is questionable, but typical company policy regarding making malfunctioning Minis right is pretty good. I have no doubt if my 1977-vintage 181-series Mini acted up, they would make it well (unfortunately, probably with a replacement).

Ruger CS has your back if you need it.
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Old April 15th, 2017, 08:27 PM   #12
 
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Update: I put the gun in the archangel spartan stock that the guy had it in. Bolt locked open fine... must be an issue of stock fit not letting the mag to lock all the way up.
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Old April 16th, 2017, 03:26 PM   #13
 
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My question is now what should I do if it is indeed the stock. Maybe get a hogue or choate and see how that works, or sand down the factory and see if I can fit it?
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Old April 16th, 2017, 04:05 PM   #14
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You have nothing to loose trying to fit it. Mixed reviews on the Choate (depending on model); the Hogue is probably a bit heavier than a factory synthetic.
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Old April 16th, 2017, 04:36 PM   #15
 
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I like the look of the hogue, how do they fit?
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