Ruger 44 Magnum Carbine

[KS25-06]

Fellow brought me an older Ruger 44 Magnum Carbine that he and a friend had almost taken completely apart to clean. However, they got stumped and stopped. They tried to put it back together and in doing so buggered the threads on the plug screw on the back of the trigger group the holds the disconnector plunger and spring in place. I need to know the proper tap for rethreading them. The treads on the screw measure .2795"x36, best as I can measure with dial calipers. However, I am not sure that I can find a tap that size. I can see why they recommend not disassembling them. Any help appreciated.

 

[hittman]

Revoke their man cards.

 

[9x19]

I don't know the size, but you could use one of these

Screw Thread/Size guage

 

[KS25-06]

That is an interesting set, may have to buy one. I have a Brownell's screw checker, and the plug screw can barley fit thru a 9/32x32 hole. The closet drill size is a J drill that measures .2770". As a last resort I guess I could drill it out to 5/16" and tap it for a plug screw that size. But was wanting to keep it original. Thanks for the suggestion.

 

[G2]

Might give Ruger a call and ask them what the spec is.
They most likely won't/ don't have the parts but might have something that would at least tell you. Might even ask if they know of somebody that might know, if they don't know.

I don't know those guns at all, but this also came to mind;

Shop the latest Replacement Ruger 44 Autolaoding Carbine Parts - Online Store

Explore the latest Vintage Replacement Ruger 44 Autolaoding Carbine Parts

jackfirstinc.com

This might help too.

Ruger 44 Carbine Parts | Gun Parts Corp.

Find Ruger Model 44 Carbine rifle parts, accessories and more with Numrich Gun Parts Corp.. Providing parts since 1950.

www.gunpartscorp.com

If you need the screw.

Disconnector Plunger Spring Screw - Original

Disconnector Plunger Spring Screw - Original - This Ruger manufactured disconnector plunger spring screw is for the model 44 semi-auto carbine and is in very good condition with light wear.

cfnparts.com

 

[mr.deerstalker]

Revoke their man cards.

now thats funny...

 

[JAYDAWG]

Don't know if this helps, but looks like the Ruger part number is /was C81.
Unfortunately, it does not give us the thread pitch........

JAYDAWG

 

[thinckley]

Might be able to find what you are looking for here: https://cfnparts.com/index.php?route=product/category&path=425

 

[Air-cooled]

Might be able to find what you are looking for here: https://cfnparts.com/index.php?route=product/category&path=425

That site does indeed have the C-81 screw.

 

[KS25-06]

The problem is not the screw cap. The problem is they buggered the threads in the hole. I have spent two days trying to find a tap, but it is an odd size. I called Ruger and got no help from them. Called 3 tap manufactures, no help. Tried to call Pine Tree Castings that made the trigger housings for Ruger and got Ruger again. I had some old info on a William C. Fisher in Goshen NH. that used to repair 44 carbines, but no phone number. Also, a KD Wilhite that worked on them, and a Mr. Deerstalker that was supposed to be very knowledgeable about them. I can find no contact on either of them. If anyone has contact info on these folks, I would greatly appreciate the info.

 

[thinckley]

@mr.deerstalker This guy?

 

[Air-cooled]

It would seem to me that if you can buy a brand new screw using the above link, then most fastener supply stores could use their gauges to tell you what screw size you have and then you can get the appropriate tap -- most of the time. I had the same issue finding a particular set screw for a motorcycle part. Even the biggest fastener supply store in Phoenix tried to match it, and they couldn't. It was somewhere between a metric and US thread. Eventually just had to buy a used part off eBay that included the screw I needed. You may wind up doing the same: buying a used trigger housing in good shape, maybe even a whole carbine that is trashed except for the housing.

 

[hittman]

…. and a Mr. Deerstalker that was supposed to be very knowledgeable about them. I can find no contact on either of them.

How hard are you looking? LOL
That deerstalker guy is an elusive creature! See post 6.
He's been a member here about as long as you have.

mr.deerstalker

www.rugerforum.com

 

[gunzo]

Suggest double checking the thread pitch as MSC Ind. Supply has 9/32 - 32 & 9/32 - 40 taps. But considering it's gun threads, the in between wouldn't surprise me.

And, a shade tree trick. Usually buggered threads like this are messed up just at the entrance of the hole. I've used a chamfer cutter to cut away the first couple of threads.

 

[NikA]

Hope you're using a set of thread pitch leaf gage on not eyeballing with your calipers to determine thread pitch. Very difficult to determine definitively on small screws without gages.