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Ruger P Series swapping

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Old 05-24-2011, 07:23 PM   #11
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AT best, you get some 40 conversions down to 9mm. And, some 40 owners get conversion barrels to go from 40 to 357 sig, depending on the brand of gun and availability of the barrel.

You will not get a 9mm/40 to up convert to a 45. Not gonna happen. Slide, barrel and frame all have different dimensions. The body of the frame (grip) will also be bigger on a 45 caliber of the same gun model. Go look at some 9mms and 45 ACP models of the exact same model (like an HK UCP9 and HK USPc45). Not the same size grip.

EVen a 1911 in various calibers typically cannot just covert like that with a simple change of the slide. Ejectors, extractors, feed ramps, etc... All are slightly different in various calibers
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Old 11-21-2013, 06:55 AM   #12
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Default I'm persistent

I now have a P90 (45ACP) that I can convert to fully functioning P91 (40 S&W) with just a slide swap, and am looking to extending this further to a P89. (9mm).

This was done without any positive input to this thread. I figured out how to do it myself.

To those negative posters here, if you don't have anything positive to contribute, then you should not be replying to people only to disparage them for their innovation. Whether it is guns or any myriad of subjects.

Originally Posted by stalkingbear View Post
They won't interchange to the best of my knowledge. I don't understand why you would want to in the 1st place as Ruger don't offer conversion kits anyway. If you have the slide/mag/barrel then you also have the frame.

You're right. They won't interchange."
ruger-p90-91.jpg   ruger-p91-90.jpg  
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Old 11-22-2013, 02:27 PM   #13
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Why don't you call Ruger? Technicians at the Prescott, AZ plant are experts in these matters. If it is a drop in conversion they will tell you the truth and order the parts for you. Calling Prescott is lot simpler than going through all of this guessing.

Sturm, Ruger & Co., Inc.
Customer Service Department
200 Ruger Road
Prescott, AZ 86301
Telephone: 928-541-8892 / Fax: 928-541-8835
(Monday through Friday 8:00am - 5:00pm MST)
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Old 12-03-2016, 06:40 PM   #14
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Default P89/P85 slide swap

I can't speak to wether the previously mentioned models can be swapped with or without modification. But I do know that the P89 slide can be swapped out for a P85 slide if required. I have personally modified the P85 slide to work with the P89 frame. My P89 came with the stainless slide and I'm not a very big fan of the two tone look. Since stainless is so notoriously difficult to darken, I decided to simply replace the slide. I found a blued P85 slide being sold at online auction for next to nothing and decided I would purchase it just to see how much modification would be required to swap the slides. It turned out to be easy. The only modification required was that the grove on the underside of the slide needs to be ground down or milled just behind the detent, and the opposite side grove may need to be widened just a tiny a bit, if at all.

The modification only took 15minutes to complete using a dremel and jeweler's file set. The key is to remove small amounts of material at a time. Frequently dry fitting to ensure that you don't remove too much material. After applying cold blue to the newly exposed metals, you can hardly tell that any modifications were done. Works just as well as my P89 slide and looks great.

I'm in no way a professional gunsmith, but I have built countless custom 1911s. As well as other firearms for my own person use. This type of modification carries a great deal of risk as any modification to any firearm can cause any number of dangerous or leathal failures during firing if the modification isn't performed correctly. If you are not confident in your abilities as a gunsmith, this mod should not be performed. If you decide to attempt this mod, do so at your own risk. Lol.

I hope this helps. And I apologize if this post violates any forum etiquette. This is my first post and I'm learning as I go.

Thanks and enjoy.
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