Rock Island double stack 10mm

us_shooter · January 03 2015 09:05:00 PM MST

Has anyone taken one of the new RI 40 S&W double stacks and converted it to 10mm? Seems like an interesting upgrade.

sqlbullet · January 03 2015 09:51:41 PM MST

I did this to a P16-40. Worked great. Doesn't like certain bullet profiles seated longer than 1.250". It is my every day fun. Have it on right now in fact.

Should be an easy cheap 10mm conversion. Just ream it .

us_shooter · January 03 2015 11:17:39 PM MST

Would like to be able to have both calibers so I can use 40 for practice.

sqlbullet · January 06 2015 09:34:10 AM MST

It is more money that way, but still only the price of a barrel and fitting.

gcw16 · January 06 2015 12:01:20 PM MST

Do the .40 mags work with 10mm or do you need different mags?

sqlbullet · January 06 2015 01:08:16 PM MST

In the Para the same mags work fine. I like the Mec-Gar mag in the gun for carry as it is a flush fit, but I like the Triple K mags for backup mags as they actually hold 17 rounds. Mec-Gar and two triple K's plus one in the pipe gives me an even 50 rounds of 180 grain 10mm JHP.

us_shooter · January 06 2015 07:05:43 PM MST

The 40 mags that come with the gun will allow 10mm. I contacted RIA about having a 40 fitted with a 10mm barrel. Their response was to buy the gun then send it to the factory where they will fit a 10mm barrel to it. Sorry, but I don't think I will send it to the factory for a month when I could fit the barrel myself in a day.
Supposedly the Mecgar P16/40 mags are what the gun comes from the factory with.

gcw16 · January 07 2015 01:21:25 PM MST

It sounds like If I just wanted to convert the gun from .40 to 10mm all you would need is to ream the chamber to 10mm and maybe add a heavier recoil spring. Would anything else need to be done?

DeltaSteve · January 07 2015 02:02:46 PM MST

Quote from: sqlbullet on January 06 2015 01:08:16 PM MST
In the Para the same mags work fine. I like the Mec-Gar mag in the gun for carry as it is a flush fit, but I like the Triple K mags for backup mags as they actually hold 17 rounds. Mec-Gar and two triple K's plus one in the pipe gives me an even 50 rounds of 180 grain 10mm JHP.

Now that's what I call self defense ${$default_smiley_smiley}$ I might need to build me one of those !

us_shooter · January 07 2015 08:16:03 PM MST

Quote from: gcw16 on January 07 2015 01:21:25 PM MST
It sounds like If I just wanted to convert the gun from .40 to 10mm all you would need is to ream the chamber to 10mm and maybe add a heavier recoil spring. Would anything else need to be done?

Yes, that is absolutely doable. However, I have one of my progressives set up with bullet and case feeder to shuck out 40's by the bucket. I also have two 55 gallon drums of 40 brass. I want to use 40 for practice and 10 for defense.

sqlbullet · January 08 2015 08:19:51 AM MST

Quote from: gcw16 on January 07 2015 01:21:25 PM MST
It sounds like If I just wanted to convert the gun from .40 to 10mm all you would need is to ream the chamber to 10mm and maybe add a heavier recoil spring. Would anything else need to be done?

You will get lots of opinions on this. Ream and it will go bang. You will then have to test for reliability.

When I converted mine, in addition to reaming I made other changes. These were to address longevity.

I replaced the recoil spring with a wolff spring, a 24# I believe. I also replaced the mainspring. I think it was 25#. And, I replaced the firing pin stop with an EGW oversized and left it flat bottomed. I have since gone back to the 18.5# recoil spring after better educating myself.

harleyhopper · January 08 2015 05:18:29 PM MST

So, did you leave the mainspring at 25#? That's what I did on my Eclipse but my RIA runs better with a slightly higher recoil spring of 20# and 25# main. Steve

I have since gone back to the 18.5# recoil spring after better educating myself.

us_shooter · January 08 2015 06:26:05 PM MST

Quote from: sqlbullet on January 08 2015 08:19:51 AM MST
Quote from: gcw16 on January 07 2015 01:21:25 PM MST
It sounds like If I just wanted to convert the gun from .40 to 10mm all you would need is to ream the chamber to 10mm and maybe add a heavier recoil spring. Would anything else need to be done?

You will get lots of opinions on this. Ream and it will go bang. You will then have to test for reliability.

When I converted mine, in addition to reaming I made other changes. These were to address longevity.

I replaced the recoil spring with a wolff spring, a 24# I believe. I also replaced the mainspring. I think it was 25#. And, I replaced the firing pin stop with an EGW oversized and left it flat bottomed. I have since gone back to the 18.5# recoil spring after better educating myself.

That's a definite given. I was gonna go with a springco recoil reducer and a 22# to start and go down from there after I get the load right.

sqlbullet · January 08 2015 09:50:03 PM MST

I did leave the mainspring at 25#.