Spring weight questions

[Sarge]

I have my new spring kit for my M&P and I am going to load some light 147gr loads. I have an 11 and 13lb spring. What am I specifically looking for if a spring is too light? Is it going to be obvious that I need to move up to the next spring weight before any real harm is done? Where should I be looking on the gun itself for impact issues?

Thanks

[G-ManBart]

I have my new spring kit for my M&P and I am going to load some light 147gr loads. I have an 11 and 13lb spring. What am I specifically looking for if a spring is too light? Is it going to be obvious that I need to move up to the next spring weight before any real harm is done? Where should I be looking on the gun itself for impact issues?

Thanks

If the gun is throwing cases a mile, that's a good indication the spring is too weak. Eventually you'll get wear that will show the spring was too weak. With a 5" slide M&P in 9mm with minor 147gr loads, I don't see how 11lbs is really too light. I run a 12.5lb spring in all my .40 Major guns with no durability/wear problems.

My M&P Pro only ejects cases about four feet with a 13lb ISMI spring in it. I'm going to try the 11lb next as I'd like it to eject them a little farther...at least I'd feel better about it. Try both and see which one feels better for you in how the gun resets after each shot. Just make sure you shoot more than a handful or rounds with each one as it takes a little bit for your body to compensate for the change and what initially seems worse might actually be better after 50-100 rounds. R,

[Sarge]

Got it. Thanks. That makes sense as my Pro only ejects about 2 ft stock.

[Dan Burwell]

The recoil spring is fighting the striker spring when the slide is going into battery so if the recoil spring is too light you will get failures to go into battery.

If you want to keep M&Ps running 100% keep the stock weight spring and turn your mouse fart loads up enough to run the gun.

[G-ManBart]

If you want to keep M&Ps running 100% keep the stock weight spring and turn your mouse fart loads up enough to run the gun.

Factory Speer 147gr GDHP self-defense ammo was only ejecting about 2ft out of my Pro....no different than generic 115gr and 124gr ammo from Winchester, Fiocchi or AAA 147gr JHP Team Glock ammo. It ran fine, but that's still weak ejection no matter how you look at it. R,

[Sarge]

I have my new spring kit for my M&P and I am going to load some light 147gr loads. I have an 11 and 13lb spring. What am I specifically looking for if a spring is too light? Is it going to be obvious that I need to move up to the next spring weight before any real harm is done? Where should I be looking on the gun itself for impact issues?

Thanks

If the gun is throwing cases a mile, that's a good indication the spring is too weak. Eventually you'll get wear that will show the spring was too weak. With a 5" slide M&P in 9mm with minor 147gr loads, I don't see how 11lbs is really too light. I run a 12.5lb spring in all my .40 Major guns with no durability/wear problems.

My M&P Pro only ejects cases about four feet with a 13lb ISMI spring in it. I'm going to try the 11lb next as I'd like it to eject them a little farther...at least I'd feel better about it. Try both and see which one feels better for you in how the gun resets after each shot. Just make sure you shoot more than a handful or rounds with each one as it takes a little bit for your body to compensate for the change and what initially seems worse might actually be better after 50-100 rounds. R,

Hey Gman.

I don't know about the 11lb spring. I put mine in my pro and you can jerk the gun out of battery by flipping the wrist a little. I don't see how that could be a good thing. Let me know if yours does the same and what you think.

Thanks

Kevin

[G-ManBart]

Hey Gman.

I don't know about the 11lb spring. I put mine in my pro and you can jerk the gun out of battery by flipping the wrist a little. I don't see how that could be a good thing. Let me know if yours does the same and what you think.

Thanks

Kevin

I've heard other folks say they found the same thing, but I've seen a number of folks say they're using the 11lb spring so I'm not sure if it's an issue. Still, I think the 13 is the most common. Come to think of it, with the 13 it doesn't take much to retract the slide a little. I haven't got my 11 yet, but will let you know what happens when I try it. Did you try it with a dummy case in the chamber?...might not come out of battery so easily like that. R,