Problems with failures to feed with Underwood Ammo, Gen 4 Glock 20

[Ezveedub]

Yes, it is more mushy. In my 26 particularly, the trigger pull felt too heavy with the "." connector & my trigger finger was actually sore after an extended range session. I also recently swapped the trigger on the 26 for a smooth surfaced Gen4 17 trigger. I don't like the ridges on the 26 & 19 triggers.

In the 20 I like it slightly better with the "." connector than the "-" as it already feels pretty light. I don't have a guage, but the 20 with the "." connector feels lighter than the 26 or 17 with the "-" connector.

Got to love these Glocks how modular they are, you can take all of the components off the frame in about 30 seconds. I have to get more familiar with completely dissasembling the slide now.

I may try the "." Connectors in my 26 and 19 Gen3s to see how they feel. I also like the smooth triggers also. The ribbed triggers do make my finger sore as well.

I did take down my Gen4s and I definitely have the "." connectors in my G20 and G22. My buddy has the same also in his G20 and G23 Gen4s too.

As for taking down the slide, it's super easy. It's way easier than the frame, at least for me that is. Only real change I made was adding Maritime spring cups to my 26. All you do is compress the small plastic cup right in front of the firing pin latch and slide the back plate off and slowly release the firing pin and extractor rod from behind the back plate. Depress the firing pin block and the extractor falls out.

[DAVIDF]

What is the advantage of the maritime spring cups? I have a Glock catalog that shows them. From the image, they look less durable than the standard. Also, they say they are available to law enforcement only or are they available in store or online? Just like the 50 round boxes of LE only Hornady Critical Duty.

Good to hear that the slides are even easier. I'll have to take my 26 slide apart this weekend. It is the oldest of our Glocks & probably has the most dirt in the slides internal parts.

[Ezveedub]

The Maritime cups are used if the pistol is used in wet conditions. Say if it gets dropped into water and/or is completely submerged. If you pull it out and try firing it immediately, you may get light primer strikes and fail to fires due to water being in the firing pin channel trying to compress against the firing pin action. The Maritime cups have notches which allow the water to drain out of the firing pin channel when the gun is fired. Since Glocks are striker fired, if you get a fail to fire, you have to rack the slide to cock it again, but you just lost a round. With Maritime cups, you're adding additional countermeasures to prevent fail to fires if its completely wet. They are not for shooting under water like most think they for.

For LE/MIL, these cups would be installed say for anyone who may be in water and has to draw the weapon for immediate usage. They are restricted to civilians, but you can find them for sale online and eBay. I think I have Ghost cups, but may get OEM Glock cups also. They may wear out faster, but any Glock that may get completely soaked in water, it's a nice option to have, especially if FL.

[DAVIDF]

Thanks for the explanation. From the shape I figured it had something to do with water draining, but I didn't think of anything like light primer strikes.

[DAVIDF]

I just received a call from Glock. They decided to send me a new 20 of my choice either Gen 3 or Gen 4. The armorer explained that since they don't have heavier ammo to test it with they would just send me the new one. I had even offered to order some Underwood & have it shipped directly to them before they made the decision to send me a new one. I along with my wife since she prefers the 20, decided to have them send us a Gen 3. The armorer who called was very considerate & pleasant to deal with.

[pacapcop]

Awsome news. Gen 3 is a workhorse. I use the 22lb Wolff spring and steel guide rod for the nuke stuff.

[DAVIDF]

Yes! I like that uncaptured Wolff spring & guide rod. I may order the same.

[4949shooter]

Excellent service from Glock. I was thinking they might send you a new one...and your choice of gen as well!

[DAVIDF]

Yes, that was very considerate of them. I have heard of someone receiving a completely different model than the one they returned. If I recall correctly, a 20 or 21 was sent in for repair/replacement & at the customers request Glock replaced with a 34. I expected to have to send it back a 3rd time. From the few others that I have heard of sending theirs back, it was replaced on the 3rd time. I am very happy with their service & will continue acquiring more Glocks

[Ezveedub]

Glad to hear they took care of you. Now you have to load up the Gen3 with the 200gr UW and take it to the range.

[DAVIDF]

Yes, I saved a box for whatever they sent back to me.

[Ezveedub]

What I find interesting, is the 200gr is not the hottest round by UW, just the heaviest gr in copper jacket. I'm wondering if OAL had something to do with you Gen4? The 135/155/165gr 10mm are hotter loads when it comes to FPS and muzzle energy.

[DAVIDF]

Could be a combination of OAL and recoil velocity? I did not try the fastest 135/155/165gr loads. I did try a 165 gr PBR Velocity Supreme (around 1340 fps) which Intercooler traded with me. They functioned OK, but I don't remember if I tried with a fully loaded magazine or only 5. All of the rest I tried were 180 or 200 gr loads. I should have kept written notes, I believe I had no problem with Underwood 180 gr TMJ with a fully loaded magazine (once Glock sent me new magazines & a new RSA). However, once I got the gun back from Glock & after they replaced a number of the internal parts of the frame, it wouldn't work with Armscor 180 gr fmj which is about 150 fps slower than the Underwood. I'll check the OAL of the Armscor tonight, now I'm curious.

[Semper Fi, 0321]

David,
I have a G20SF Gen3, been having the same issues with FTF for almost a yr now. Bought a aftermarket bbl from Storm Lake after having a KB from hot handloads and OEM bbl.
Replaced the RS with the ISMI rod and 20-22lb springs, replaced the trigger spring too. Replaced the magazine springs with Wolf +10 mag springs. Still same problem with 200-220 gr hard lead from both Underwood and my own handloads using Doubletap lead  bullets. About ready to sell this thing.
My girlfriend shoots a S&W 1006, awesome pistol with no problems whatsoever!!! However, they have doubled in price lately, none to be found at a reasonable price.
I live in NW Wyo., big bears are a problem here and I switched from a Ruger Bisley .45 LC with nuclear handloads to a G20, I think I'm going back to my big revolver until this FTF thing gets worked out. Thanks for the test reports, I'm kinda doing the same thing with no changes in performance so far. I really liked the idea of a affordable(?) semi-auto that would work in self defense for big critters.

[Ezveedub]

It's seems odd, because Hickok45 has shot 230gr hardcast and then 220gr through a stock barrel and aftermarket barrel in the Glock 20 G2 or G3 and he never mentions any FTF issues. I'm just wondering if anyone having issues has had anyone else shoot their Glock 20 and see if the same issue occurs?