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Ruger Mark IV - Receiver Frame Screw

This is a discussion on Ruger Mark IV - Receiver Frame Screw within the Ruger Rimfires forums, part of the Pistol & Revolver Forum category; I've got a new Mark IV. Target model - 5.5" Stainless. I've put 500 rounds through it. My issue is the Receiver Frame Screw continues ...


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Old October 17th, 2016, 11:55 AM   #1
 
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Ruger Mark IV - Receiver Frame Screw

I've got a new Mark IV. Target model - 5.5" Stainless. I've put 500 rounds through it. My issue is the Receiver Frame Screw continues to unthread itself. It isn't a hex screw...more like a round knob with an indent in it.

Anyone else having this issue?

If it were a hex head, I'd just tighten it down but there really isn't a way to apply torque to it. I've used an eraser from a pencil to create friction without marring it but it doesn't tighten down enough to prevent continued unthreading.



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Old October 17th, 2016, 02:25 PM   #2
 
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Have you got a pic? I've got the Mark IV target as well but not sure what you're referring to.
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Old October 17th, 2016, 04:55 PM   #3
 
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Can't really tell from the exploded drawings on the net. Could it be a Torx fitting?
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Old October 18th, 2016, 09:11 AM   #4
 
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Clean/degrease the threads & apply 1 drop of blue Loctite.

You can also call Ruger with any ?'s. They are very friendly.

Good Luck!
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Old October 18th, 2016, 02:32 PM   #5
 
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Quote:
Originally Posted by hexagenia View Post
I've got a new Mark IV. Target model - 5.5" Stainless. I've put 500 rounds through it. My issue is the Receiver Frame Screw continues to unthread itself. It isn't a hex screw...more like a round knob with an indent in it.

Anyone else having this issue?

If it were a hex head, I'd just tighten it down but there really isn't a way to apply torque to it. I've used an eraser from a pencil to create friction without marring it but it doesn't tighten down enough to prevent continued unthreading.
If it is what I think, it take a star type bit and will tighten up nicely, as mine was loose, tightened and after 500 rounds still tight. Good Luck
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Old October 19th, 2016, 11:54 AM   #6
 
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I saw this thread and went home to inspect my Mark IV Hunter. Sure enough, my receiver frame screw had also backed out quite a bit. I was able to tighten it down with a standard allen key (not sure the size, but small) and will keep an eye on it. It was hard to tell by looking what tool was needed, but allen keys do fit perfectly.
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Old October 20th, 2016, 06:53 AM   #7
 
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Quote:
Originally Posted by Bozwell View Post
Have you got a pic?
+1

A close-up pic of the screw head sure would help.

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Old January 9th, 2017, 01:56 PM   #8
 
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Sorry for the late reply, It's a #10 torx screw so I'd be careful using a stander allen wrench on it, you will destroy it eventually.
Just checked mine and it's very tight. It looks like it's torqued to about 25 in lbs.
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Old January 9th, 2017, 03:32 PM   #9
 
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The receiver frame screw takes a 3/32 the same size as the grips do. THE T-10 torx will fit but it does not go deep enough into the head of the screw to work properly. I called ruger to confirm this back when I bought my hunter model. If your screw is working loose some blue loctite will take care of it.
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