Most important question sir!  How does it shoot?

Nice work on this list!

"Slide stop lever" is the proper name but you see guys using them to release the slide all the time in competition, including me.  That's why we have extended levers and why we go to great pains to make sure the gun reliably feeds when operated in that way.

Nice!  I'd love to take the afternoon off to go shoot that bad boy!

Quote from: Hamopr on August 23 2017 11:55:02 AM MDT

Quote from: GunBugBit on August 23 2017 09:05:37 AM MDT
Your gun is probably fine, but with a 1911, especially one that's had  trigger job, you don't want to slingshot the slide nor otherwise let it drop on an empty chamber.  It bounces the sear engagement point on the hammer face.  Also, it's a best practice to hold the trigger down when working the slide (when it's unloaded of course).

I have no doubts the gun is fine, I consider this a minor issue that most likely will self correct with a few dozen rounds down range. If not, it's certainly a minor bit of tuning.

I learned a long time ago not to let the slide drop on an empty chamber. If the chamber is empty I ride the slide into battery with my left hand. If the gun is loaded, that's a different story. I prefer to slingshot the slide when I have a loaded mag inserted but have been known to use the slide release lever at times.

Nick

Oh, I thought you said you were slingshotting with an empty chamber.  I think most 1911s can withstand a few reps of that, so that's why I was saying your gun is probably fine.

I'm jealous of your 10mm 1911!  I hope you have great times with it!

Quote from: Hamopr on August 16 2017 03:14:16 PM MDT
Checked it for function and all seems well until I lock the slide back on an empty magazine. At that point I cannot operate the slide lock lever nor will the slide travel to the rear to slingshot back to battery. It's like the slide is locked in that one position. Remove the magazine and the slide operates normally, releases with the slide lock lever or by slingshot method.

Your gun is probably fine, but with a 1911, especially one that's had  trigger job, you don't want to slingshot the slide nor otherwise let it drop on an empty chamber.  It bounces the sear engagement point on the hammer face.  Also, it's a best practice to hold the trigger down when working the slide (when it's unloaded of course).

First thing I do with any new Glock is toss those factory sights.  I know I'm not the only one.

Just really pleased that the G20 is now what I hoped it could be.

Quote from: GunBugBit on August 21 2017 10:11:43 AM MDT
At the risk of being incorrect, I'm going to say I got the spring from Wolff.

One thing I can tell you, the spring is not flat coil but round coil.

Poking around just now, I see that Glockmeister sells a 24-lb flat coil captive spring on a steel rod.

http://www.glockmeister.com/Glockmeister-Stainless-Steel-Recoil-Spring-Assembly-for-Gen-4-20-21-40-41/productinfo/G4SS20CS/

I have a couple 22-lb versions of this but a 24 is what's in my gun right now.  Also have a 20-lb flat spring.

Still don't know for sure the source of my non-captive round coil setup.  The rod has a screw in the end so I can change out springs (a non-captive setup).  I'll take a pic of this if I think of it, a few might be interested.

I would go to lower spring weights if shooting the milder 10mm, but I want to shoot mainly Underwood and if 24-lbs is what works for those loads, I'll keep it in the gun.  Next session, I might see if the 22-lb works.

Quote from: sqlbullet on August 21 2017 09:04:10 AM MDT
Thanks for the feedback.  That is good news.  I always hate to hear about a Glock that is sick.

Thanks!

Good question and I am not good at remembering where I order all of my parts from.  With my 1911s, I can usually recall where I got my parts, but with Glocks and ARs, not so much.  I had to find  a company selling a kit including the little adapter for the forward slide hole.  If I come across where I ordered the rod/spring/adapter from, I'll post it here.  I think I got the spring from one company and the rod and adapter from another company.

At the risk of being incorrect, I'm going to say I got the spring from Wolff.  I will have to think harder or dig up where I got the rod and adapter.

A new mag catch spring was the ticket. Perfect function last Saturday with 15+1 rounds of Underwood 150gr JHP at 1500 fps! In case anyone is wondering, I'm using a 24 lb recoil spring.

I'd love to say my G20 issues are entirely sorted out.  Seems the gun is suffering from a weakened mag catch spring.  Have to be careful when switching out mag catches not to flex that little rod spring so much that you put a bend in it -- very easy to do.  I ordered replacements.

Having had a chance to read more material from other G20 Gen 4 owners, I see that my issues are not unique to me and this gun.

I'd be pleased as punch if there were a simple remedy for the last round not feeding.  I've read about guys reshaping their slide stops, trying different slide stops, using stronger mag springs, etc., with varied success.

Clearly Glock did not set these guns up to handle anything beyond medium-hot 10mm, and they seem to want to stay out of the business of helping Glock owners validate problems they have with the hotter loads.

Update on the Gen 4 G20

I was able to go out and try the gun with the KKM barrel and a Wolff 24-lb recoil spring, using 150gr (not 155gr) Underwood XTP loads stated to shoot at 1,500 fps.  I also shot about 70 rounds of Underwood 180gr XTPs shown on the box to move along at 1,350 fps.  So these are pretty hot loads.

I also shot about 30 rounds of Hornady 180gr XTPs, advertised at 1,180 fps.  These shot reliably in the gun from the beginning, and did so once again.  I'm happy these will cycle the gun with the 24-lb recoil spring.

The mag dropout issue appears to have gone away.  I should note that I now have an aluminum mag catch in the gun.  I don't like how extended it is because now the chance of operator-induced mag droppage is greater.  I can reshape the external button or go back to a factory part, and I'd even consider cutting down the factory mag catch button somewhat.  I personally do not need that big of a  button since my thumbs are not short.

There were a couple of failures to feed early on, which I attribute to the new barrel and a somewhat dirty and dry gun (my bad).  Things smoothed out as I got a few mags into the shooting.

A new issue that emerged is the slide locking back when the last round is at the top of the magazine.  This didn't occur when loading only 5 rounds in a mag, but only occasionally when loading 10 or more rounds in the mag.  My last string was with a full mag +1 in the chamber, with the Underwood 180gr XTPs.  All rounds fired except for the last one which sat on top of the mag with the slide inexplicably locked back.  A quick rack-bang was successful in every case where this happened.  I'll sort this out eventually I'm sure.

Now that I've cleaned the gun well, I'll report back after the next range session.

The Good
The trigger is really pretty good.  I have not done anything to it so it's supposed to be around 5.5 lbs, but it feels lighter and is not as mushy as other Glock triggers I've used.

The gun is comfortable to shoot with the hot loads.  I shot whole magazines one-handed, rapidly, and was not bothered at all.  I won't claim I can completely contain muzzle flip but still, the gun is quite controllable and causes no pain.  I use roughly the same grip pressure I use when shooting mild .45 ACP out of a 5" 1911, and it is enough.

I was shooting at a variety of targets and was hugely pleased how I can put bullets where I want them to go.  The 70+ competition matches I've shot have helped my overall handgunner skills, and it is satisfying to see them show up with the G20 shooting hot loads.