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Ruger repair / Investment casting vs MIM?

This is a discussion on Ruger repair / Investment casting vs MIM? within the Gunsmithing forums, part of the Firearm Forum category; I sent my SP101 .22LR back to Ruger because it was spitting lead occasionally. The repair shop said the timing was off. I got it ...


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Old May 4th, 2017, 03:52 PM   #1
 
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Ruger repair / Investment casting vs MIM?

I sent my SP101 .22LR back to Ruger because it was spitting lead occasionally. The repair shop said the timing was off.
I got it back yesterday and re-installed my shims and Wolff springs. I noticed right off that the MIM hammer had been replaced with a machined investment casting (which does look nicer) and abit later noticed the trigger was also an investment casting (no groove up the back and I think they replaced the complete trigger group.
I am assuming this is a good thing??
I think it does look better and I am hoping the beefier hammer will wack the .22LR primers harder so I can use the lighter springs.
The action is very smooth and the trigger break is very crisp!
Can't wait to try it out!
Let me know your thoughts on them changing out MIM for machined investment cast parts!



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Old May 4th, 2017, 04:05 PM   #2
 
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I forgot to mention after the return of my SP101 from the Ruger repair shop I installed a Pachmayr Diamond Pro grip!
Really has a nice feel! Shorter than the Hogue and soft plus really fills your hand and plenty of room for the pinky finger!
Also in the photo you can see the investment cast hammer that replaced the MIM.
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Old May 5th, 2017, 07:58 AM   #3
 
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I, personally am not a fan of MIM parts, but if anybody should know how to make them, I would think it would be Ruger. Used to work at a gun shop and range. Sold a guy a brand new Rock Island Armory 1911 (which, although inexpensive, are usually decent guns). He went right out to the range and the safety broke right off of it! Sure enough, a MIM part. If done right, MIM parts are supposed to be as tough as anything else, but if not, when they break they just break. I suppose the same could be said for cast parts too. When Ruger first started making castings the old guys thought it was a cardinal sin. Now I am the old guy and don't like MIM parts, and still aint really fond of plastic guns either! So, take it for what it's worth.
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Old May 5th, 2017, 08:45 AM   #4
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I decided to be OK with MIM parts a while back otherwise I was gonna turn into one of those curmudgeonly guys that won't buy a new gun made by anybody due to adopting an anti-MIM attitude. So I have a lot of newer Rugers and S&Ws with MIM parts and I haven't had any problems with any of them yet. And while the process of metal injection molding and investment casting are different, still, to my non-metallurgist mind they seem similar enough to find it a bit incongruous to be OK with one method of putting molten metal into a mold but not another. Maybe the S&W purists can be a bit more righteous with their forged frames.

My only minor beef with the MIM hammers I've seen on the SP101 is the mold line that often appears up the back of the hammer. It's just a little cosmetic thing but some have been pretty obvious and it bugs me. Has nothing to do with function however. On the other hand the MIM triggers have generally been nicely finished and seem to generally lack the sharp edges some of the old triggers had.

I'm OK with MIM. I even went so far as to decide to not let the internal lock annoy me on the new Smiths - I just ignore it. And I have some pretty nice guns that I like a lot since I decided not to get hung up on either one.
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Old May 5th, 2017, 09:35 AM   #5
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You can buy new guns without MIM parts if you are willing to pay the price. For instance, with 1911s, Dan Wesson and STI now advertise that they use no MIM parts, but those guns start well north of 1K and, of course, once you move into the Les Baer, Wilson and Brown 1911s for even more money, no MIM. Along with that you get more fitting and hand selection of parts as part of the package. Is it worth it? Only you can decide.

As for me, I've had both cast and MIM parts break. Not very often, of course, but it happens. Just part of owning guns I can afford to shoot. Sure, I'd love to return to the days when every day, affordable guns were made of machined, forged, tool steel, but those days are never coming back.

My main beef on so many new guns, these days, is lack of finishing and good old fashioned quality control. I've been on the receiving end of way too many guns that even the most rudimentary inspection would have kept at the factory and rejected. Not just talking cosmetics, here, either. I'm talking about guns that failed to function. As far as I'm concerned, the MIM issue is small potatoes, by comparison.
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Old May 5th, 2017, 10:43 AM   #6
 
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Originally Posted by North country gal View Post

My main beef on so many new guns, these days, is lack of finishing and good old fashioned quality control. I've been on the receiving end of way too many guns that even the most rudimentary inspection would have kept at the factory and rejected. Not just talking cosmetics, here, either. I'm talking about guns that failed to function. As far as I'm concerned, the MIM issue is small potatoes, by comparison.
Totally agree. Nowadays it's not the cost of a new gun that is the hurdle before the purchase, it's the question of will I get my money's worth.


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Old May 5th, 2017, 05:44 PM   #7
 
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I talked with a repair tech named Elwin after my gun was returned and asked why the MIM was replaced with investment casting.
He just said "it had a better profile" and he wants me to call him after I get a chance to shoot it and let him know that I am happy with it!
They did a nice job cleaning up some machining marks and repolished it, it looks really good!!

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Old May 5th, 2017, 05:46 PM   #8
 
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mim is fine investment cast is better.
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Old May 8th, 2017, 07:55 AM   #9
 
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Old May 11th, 2017, 07:04 PM   #10
 
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mim schim. it's good done well like all other processes and better that some. alloy, heat treat and profile have more to do with method of manufacture.
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