G17.5 MOS recoil spring weight

[Tnbb33]

What’s the correct recoil spring weight for a gen 5 17 mos for carry optics? 

[Aircooled6racer]

Hello: I am going to try an 11 and 13lb ISMI and also a 12lb Wolff in my new gen 5 17. I have to get a guide rod for the Wolff springs still. The testing will start tomorrow. Thanks, Eric

[floater]

Depends on your load and how you like the gun to act in recoil. For my load and what I like to see in recoil a 14lb wolff seems to work, I might try a 13lb or 12lb sometime in the future.

[Braxton1]

Please remember that the Recoil Spring Assembly is slightly longer in a Gen5 than a 2/3/4.  A spring designed around the dimensions of the Gen3 or Gen 4 length will exert less pressure than one designed for the 5.  That being said, expect to run "one increment higher" than you ordinarily would, i.e. using a 13# where an 11# felt great in your old gun.

[tdp88]

I run a 13lb ISMI at 135PF

[Tnbb33]

Thanks for the replies. 

[mpmo]

Deleted.  Googled it.

 

Edited January 26, 2021 by mpmo

[rootacres]

ISMI 11lb or 13lb. I really cant tell much of a difference between the two. Using 132PF 150gr TBB. 

[rpm8300]

I would say 11 with 147 grain or heavier but keep an eye on the spring balance between the striker and recoil spring. With an 11, you have a slightly higher chance of fail to return to batter on unloaded starts if you don't do a clean rack.  Additionally, 11 is about the practical limit to how light you can go with the platform.  11lbs recoil with a 4 or lighter striker spring should be fine.