Just want to post that after replacing the Slide stop lever and the slide lock spring my Glock 20 SF is feeding the last round in my mags.

I only shot two different loads in it today and it didn't matter if I put 2, 3, 5, 10 or 15 rounds in the magazine that last round fed great. NO malfunctions at all. 

My Curse of the 10mm is OVER.

Thanks guys for all your help. 

I will put more and different rounds through it just to make sure everything if perfect.

Just wanted to update you all.

Thanks

Brian

Excellent news!

Crazy how one little thing can wreak all kinds of havoc.

Congrats! That's how they're supposed to work!

It was funny when I changed just one of those things it got better but NOT perfect.  It took me replacing them both for perfect function.  Go figure


Brian

Quote from: 445 supermag on July 21 2013 06:33:15 AM MDT
It was funny when I changed just one of those things it got better but NOT perfect.  It took me replacing them both for perfect function.  Go figure.

OK, but what about the spring and lock back lever do you think was malfunctioning to lock the slide back before the last round? And, sorry if I missed it, was it happening on mid-range loads also. I'm having the problem only with full house Underwood and BBore loads. Many thanks.

One thing that Smith and Wesson noticed with the development of the S&W1006 prior to the 1076 build, was that with the higher impulse loads was that the slide lock and stop notch although they were fitting correctly, the impulse induced a bounce of the slide stop, that was seen on high speed video.  This bounce cause the slide stop to drop back out of the stop notch, causing the slide to close on an empty magazine.

Now in relations to the Glock, accelerated slide speeds from the higher impulse ammo can cause several things to happen with the timing.  The slide may over run the next round in the magazine, either the round doesn't pop up fast enough (extra strength mag springs may help)  recoil system springs may be used to tune the slide velocity to help slow things down.
However, not all recoil systems work correctly.  Some have noted the round wire springs can bunch up, adding drag or short cycling the slide, not letting it travel far enough to the rear to pick up the next cartridge.  The flat wound springs seem to be better for all the post I have read.  Some may not adjust the velocity correctly to slow things down, or may return the slide to the forward cycle too soon.  Adding things like lasers or lights to the rail have caused stresses along the frame that induced drag to the slide function.

Adding things like RMR red dot sights will change the mass of the slide slightly as well. 

So finding the balance with the ammo of choice is sometimes a trial and error, with emphasis on the latter.

One thing I really like as it pertained to my G-29 was the use of non-captive recoil springs.  I feel that it maintained lock-up better than the factory captured guide rod and springs.

So far I am working with the factory captive recoil system with my G-20SF, but I am searching out a non-captive spring system to provide flexibility of tuning with spring changes for the gun & function as it relates to the ammo in use!

Quote from: eqlzr on September 08 2013 08:15:38 AM MDT

Quote from: 445 supermag on July 21 2013 06:33:15 AM MDT
It was funny when I changed just one of those things it got better but NOT perfect.  It took me replacing them both for perfect function.  Go figure.

OK, but what about the spring and lock back lever do you think was malfunctioning to lock the slide back before the last round? And, sorry if I missed it, was it happening on mid-range loads also. I'm having the problem only with full house Underwood and BBore loads. Many thanks.

So sorry for not seeing your post and sorry to hear of your problems.   Glock perfection ...YEAH RIGHT !

I TRUELY DON' T KNOW what or the why it was happening I really dont.   I had some people saying it was me hitting the slide lock lever accidentally and that might be the cause.   Ugg. Lol.  Like it ONLY happened with the last round lmao every time.   

But I have to also say it was not every ammo caused this some ran great and some not so great.   I just didnt see any rhyme or reason for it.   Some hot stuff fed and ran great and some didnt .  And some of the weaker rounds fed great and some didnt.   It was very frustrating to say the least.

I wish I could be of more help but I would give those 2 things a try and change them as they are only a couple bucks each and thought It was worth a try.

Best of luck

Brian