Glock 31 357sig question [Archive] - Glock Talk


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04-01-2011, 12:25
Hello, new to the forum and have a question. I can get a very good deal on a new 31 in 357sig. I can't reload for it due to my press is pistol only, and Dillon does not make dies for the sig round. I want to convert it to a 9mm using a loan wolf barrel for my girlfriend to shoot steel with. I want to keep the recoil as light as possible by adjusting the loads and the springs. What would be a good starting point?


04-01-2011, 20:12
You can convert the G31 into a 9mm or 40 S&W by simply swapping barrels & mags.
See the 22-9 barrels here
See the 22-40 barrels here
You may have to drop the recoil spring weight down to 11 lbs to shoot 115 gr loads. The only way to know for sure is to try it. If you have a FTE issue pick up the guide rods here

04-02-2011, 09:34
Thanks for the reply. She is going to shoot it tomorrow, so I will see how she does with the 357sig and go from there.

04-10-2011, 19:53
Well the 357sig was a bit to much for her. I shoot 124gr FMJ for my open gun. Would they work with a 9mm Lone Wolf threaded barrel & comp, or would it be better to stick with the 115gr bullets? I'm planing to try it out with a factory load, and go from there.



04-11-2011, 15:03
You have to try them and see how they work. Comps will only perform if you feed them ample amounts of gas. My guess is you are good to go....

04-14-2011, 22:54
How is the Wolf barrel compared to the Glock barrel as far as handling higher pressures for the hotter comp loads?

04-15-2011, 20:40
We have a lot of customers running 9mm Major out of our 9mm conversion barrels. I have not seen one blown up yet. It will be interesting to learn at what point they finally let go?

04-15-2011, 21:43
JR, thank you for all your help. I'm going to try out my loads I'm using in my XDM open gun. I will start out a bit lower, and work up from there.

Thanks again!


04-20-2011, 21:32
I went to the range today for some testing. The barrel and comp worked great. I loaded some 124gr MT gold FMJ with 6.0grs of AutoComp. It shot nice and flat, with a very comfortable recoil. I think she will be happy with it.