Adding to an old post.

Just recently ran into a problem with my Witness Stock 3 with factory magazines.
The nub on the slide-lock that engages the follower on the magazine is very small and barely engages the follower.   I traditionally have used the same two magazines for most of my shooting.   The magazine followers eventually got to the point where the nub was pushing the follower to the side on the last round - follower had a wear mark right on the edge from the nub.   

When pushed to the side by the slide-lock nub, the follower was pushing the magazine against the trigger bar.   I was getting slow to no trigger resets on last rounds.   Also the the slide-lock was not fully engaging - take the magazine out and the slide slammed home.

I looked at my other magazines that I didn't use very often and confirmed that even on a brand new one the nub was barely engaging.    Examined the slide-lock and it was undamaged.   Ordered a new one and it looks exactly like the old one.   So not broken, a design issue.

I got some JB-Weld and built up the nub on the slide-lock.   After it cured I took the slide off the gun, reinstalled the slide-lock and inserted a magazine with 1 round.   Using a set of swiss files I filed down my built up slide-lock until it could clear the rounds in the magazine, but still fully engage the follower.

Works great now and all the issues have disappeared.    Hopefully the JB-Weld will last a long time.

In my SAO P220, I run a 180gr polymer coated bullet (Bayou Bullets) with 6.0 grains of Power Pistol.   These are very accurate, always cycle the action and pretty light recoil.  I don't have a chronograph, so I can't say anything about fps.

While sorting thru some fired brass that I had I always run a large magnet over the brass to pickup any of the steel cases.

It picked up about 25 fired cases in 9mm that looked exactly like all the other brass cases.   

So i'm guessing there is company that is now brass plating steel 9mm cases.   Great....

I didn't record the head stamps - sorry.

So beware.

I had the same problem with the rear adjustable "target" sight coming loose all the time on my 220 SAO 10mm.   flopping all over the place before a range session was complete.   blue loctite was not enough.   Since it was still only a couple of weeks old.   I sent it back to Sig.   Received it back in 2 weeks and the rear sight is locked down solid.   Have been to the range at least 15 or so times since i got it back and it has no play in it.

Not sure where it fits into the list, but my Stock III in 10mm has been 100% reliable.  Only mods are a Hennings cone guide rod and a 22# recoil spring.   Runs like a top.

At least in the Witness the stock guide rod had very little surface contact inside the frame.   Led to damage with stiffer loads.   I have been told that since I bought mine that the Witnesses were going to start using the same guide rod that I had purchased as the new stock one.   I have not verified if this took place or not.   I'm happy with mine.   

Like I said, not sure if this even applies to your pistol or not.

lol

I asked the same thing about my Witness Stock III.

Not sure they share the same return spring guide rod or not, but that is what i was advised to replace.    The Hennings cone guide rod is what was recommended.
I also beefed up the return spring to about a 20-22# version.

Other than that, my Witness is stock.

I own one.   Bought it about 2 years ago???

Love this pistol.   It looks awesome and shoots better than any of my other 10mm's I've had- at least for me.   I guess that is why i got rid of the others and kept this one.

I love the wood grips, but they move around in my hands when they get slippery with sweat.   They are NOT aggressive at all.

I have a set of hennings aluminum grips (orange) on it and they offer a great grip - first time using aluminum grips on a pistol...

By the way I tried the lok grips and could not keep them from moving around on the frame no matter how hard i tightened them down.   They seem to sit on top of the frame rather than fitting within the cutouts.   At least that is what i remember from messing with them.   I had to have been about 1 twist from cracking them and they just kept moving around.

Sticking with the hennings for now.

I followed some advice I received from this forum when I first purchased it.
Replaced the return spring guide rod with a cone end one.
Upped the return spring weight to 22# or 24#.

I made my own decision and replaced the front sight with a dawson precision fiber optic - like that a lot better than the solid black blade that it comes with.

Glock 17, running my handloads.   Was when i was using a single stage press.   Some how some way I had a round that received extra powder.   Went shooting.   A fireball came back out of the pistol towards my face, blew the nearly full magazine out of the pistol on to the floor and stung my hand something fierce.   The 9mm case had ruptured right at the extractor groove for about 3/4 around the cartridge.   Scared me.  Luckily the pistol took no damage - amazing.   Checked everything out and went back to shooting.   The one and only time I had this happen.

then I was running 115 gr bullets with Win 231.   Now I run 124/125 gr bullets with Win 231.   Not as much room to allow for extra charge.

I use a Dillon 650 now with the powder check on it.   Periodically spot check my powder in the case.    Every thing runs fine and never have a problem.   Only had it happen once, once was enough.

I won't talk about the day a 10mm round found it its way into my .45 acp ammo bag and how the round fed perfectly in my Sig P220 and it fired fine too.   Didn't eject since the cartridge looked like lace after it had expanded to fit the chamber.  It didn't just crack, the entire case exploded to the circumference of the chamber.   I now use separate ammo bags for my 9mm, 10mm and .45 acp.   So there is less danger of cross contamination.

I run a captured 22# spring on a tungsten guide rod.   I think i got mine years ago from the Glock Store.   Never had any feed issues.   Runs great.

Zev Trigger.   Completely changed how I felt about my Glock 20sf.   Went from meh...  to wow.

SIG P220 10mm SAO.

This gun is built like a tank.   I had the DAO two tone model.   great shooter and well built.   It is heavy, but that weight helps when shooting.   Can definitely take on hunting loads.   All stainless steel frame and slide.

I've had/still have Glock 20sf, Kimber Eclipse II, Sig P220 DAO, and Witness Stock III.

Use a KKM Precision barrel.   Never had any accuracy or reliability issues at all.

Hi have the Dawson on mine.    Second the advice about the loctite.   With that on there, there has been no play at all with the front sight.

RMR Bullets (Rocky Mountain Reloading) usually has a very decent price on copper plated 10mm bullets.   If I remember right they have a heavily plated option that is practically the same as a jacketed bullet.   With plated bullets, just don't exceed 1500 fps muzzle velocity.   I've seen this warning several places over the years.   I'm guessing they fear that over 1500 fps, that the plating will get peeled off the bullet.
They also offer pulled bullets.   I believe they usually have pulled Federal HST's.

Bayou Bullets has several nice polymer coated options available.   

Both places periodically offer sales and/or free shipping.