I just bought a 9mm shield and tore it completely apart and polished everything, if it was inside the gun it got polished, sear, rails, etc... Everything! When I reinstalled the parts I wiped everything down with WD-40. I went to the range today to see how it would function. It was extremely smooth. I did have one problem though, about 20% of the time the slide would go to far back and hang up. I would have to smack the back and then it would go into battery. It would travel past the slide stop lever even when the magazine was empty. What I'm wondering is if anyone would happen to know if there is any kind of slide stop for the shield?

Welcome to the forum.

What do you mean, you "polished" it? How did you polish it, and what did you use? Why did you feel this was necessary? Just curious.

Hi Watchdog, thank you for the welcome. It felt gritty when I tried the trigger, the slide also. I do this to all of the guns I buy. I use emery files. Along time ago I figured I could run 1000 rounds through the guns I buy or just polish everything and end up with the same results.

New 9mm M&P Shield - slide getting jammed back.

This is where to polish.....but s&w should be on this by now.

thomast, thank you so much for the information. That is it! I checked the barrel inside the slide without the spring and pushed the barrel forward and sure enough it jammed into the slide with a lot less force that when it's being fired. I also searched the forum before posting but did not see anything that helped. Thank you so much.

You are welcome! Thanks to the guy who posted the original fix as well!

I'm glad this info helped you out,

I did the same, polished almost everything, plus the barrel and internals, it runs like it was on butter, no issues with mine.


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M&P 9, Shield9.

If you're using WD 40 as a lubricant, you may not be reducing friction as much as you would with a dedicated gun lubricant. WD 40 was designed as a water displacement product (hence the "WD"), with some lubricating benefits. It was not designed for the kind of friction stresses created by semi-auto slides.

I've had very good results from two brands of gun greases: Slip 2000 Extreme Weapons Grease, and Mil-Comm TW25B Grease. My M&P 40 Compact has over 8500 rounds through it with no discernible wear on the barrel. I've used TW25B Grease on it exclusively. Slip 2000 has done a great job with my new Shield .45. I had a couple of unwanted slide lockbacks on my first range visit, so I tried Slip 2000 because I'd read on the SIG Forum that SIG uses it as their factory lube. I'm now up to 1000 rounds, I've had no lockback problems since switching to Slip 2000.

This is not to say that you don't have a barrel-slide fit issue, but a quality lube will certainly help to improve the situation.

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What, me worry?

Hi swsig, thank you for the information. I will take your advice and try the Slip2000, is it a Grease or Oil based lube? Missed it in the add. I was aware of the WD-40 information.
I'm sure that I have the slide fit problem. I have since polished the problem areas. It is much better now but still has some slight friction, I'm hoping the slide spring will now have the power to return the slide to full battery. Once again thank you.

Slip 2000 ewl is a petroleum based oil.

I use it.

I also use tetra gun grease and lube. It works well also .

Slip 2000 comes as either an oil or a lightweight grease. I use the grease version because it comes in a syringe that makes placement fairly easy. The grease version is synthetic. (Here is the website: https://www.slip2000.com/slip2000_ewg.php). The recoil spring assembly on the Shield is quite stout, and a good lube will help it return the slide to battery more efficiently. Given the rate at which it's used for the light lubing called for by S&W, a syringe of Slip 2000 should last you for a very long time. Unless, of course, you have a whole bunch of S&Ws.

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What, me worry?

Update: After reading the post and taking the advice, I polished the troubled areas that were pointed out on the barrel and slide. I could not find the Slip2000 locally but did find some Tetra in my gun cleaning bag, so being a impatient person when it comes to my guns decided to use it instead.
Now for the range result. I ran 100 rounds through it without any kind of problem what so ever. I'm extremely happy with the end result and appreciate the advice you gentlemen gave me. Once again, Thank You All for your input.