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

DAVIDF · August 19 2013 08:28:04 AM MDT

Ezveedub,

How was the accuracy with the Underwood? I have found their ammo to be the most accurate, particularly the 180 TMJ. I haven't tried the 200gr TMJ. But the Speer TMJ bullets seems to work really well. Same bullet loaded in the Blazer & that one is close to the same in accuracy as the Underwood.

Also, yours functioned well with a full magazine? That is where mine has the most issues. It will usually work with 5 in the magazine, but when it gets to 10 to 15 loaded it fails constantly with the Underwood 200 gr & PBR 200 gr Velocity Supreme.

Ezveedub · August 19 2013 10:48:39 AM MDT

Davidf,

I loaded all my mags fully with 15rds. Not one issue occurred. The accuracy seems to very good with the TMJ. My G20 had only seen 15rds since new, and it was only Georgia Arms 180gr JHP that was used. I wasn't too happy the 15rds with the GA ammo. The Underwood 200gr TMJ is a fast round and was more accurate for me than the GA FMJ 180gr. It's definitely a full power round. I will have to try different grain weights of Underwood when I get a chance.

I was shooting various calibers yesterday, so my accuracy was a bit off with all the pistols I was testing yesterday. The UW 200gr 10mm, WWB 357 SIG and Speer 200gr .45+P ACP in a 1911 Officers model was a heavy recoil practice round at the range yesterday, LOL. I with all that heavy shooting, I swapped back to the Glock 20 to see if anything would happen with various shooting conditions, but it worked perfectly.

4949shooter · August 21 2013 07:07:12 PM MDT

What weight RSA are you running?

Ezveedub · August 22 2013 11:28:58 AM MDT

Quote from: 4949shooter on August 21 2013 07:07:12 PM MDT
What weight RSA are you running?

If you're asking me, I'm using the stock Glock 20 Gen4 RSA. I did get the Rachis RSA from Davidf, but when I checked the installation fitment, the spring is right up against the barrel and seems to rub against it when cycling the slide. I will have to check the part number on my stock RSA when I get back into town. The Rachis RSA that Davidf sent states it has a 17lb spring, which seems weaker than the stock Glock Gen4 RSA when I cycle the slide. The stock RSA has continuous spring force all the way to close, while the Rachis seems to loose some tension when the slide is closing. I think that's when the spring is starting to rub the barrel. I will probably install the Rachis RSA and try the Underwood TMJ 200gr this weekend to compare it to my stock Glock RSA.

4949shooter · August 22 2013 05:45:55 PM MDT

Okay sounds good. Hopefully the Rachis RSA will work. I am thinking you might have to go with a heavier spring weight though, like a 20 or 22 pound.

I don't know if they make the heavier springs for the Gen 4 though.

Ezveedub · August 23 2013 07:01:14 AM MDT

Quote from: 4949shooter on August 22 2013 05:45:55 PM MDT
Okay sounds good. Hopefully the Rachis RSA will work. I am thinking you might have to go with a heavier spring weight though, like a 20 or 22 pound.

I don't know if they make the heavier springs for the Gen 4 though.

Most people just get the Gen4 recoil spring adapter and run Gen3 RSA in the Gen4. Simpler to do that IMO.

DAVIDF · August 23 2013 11:03:58 AM MDT

No, a heavier spring is currently not available for the Rachis. Not from Brass Stacker anyways.

I am hoping that someone makes a heavier Gen 4 specific RSA for the 20 before too long. I have an adapter and use Gen 3 guide rods on occasion, but it does not fit the same way in the frame as in a Gen 3.

The_Shadow · August 23 2013 12:56:26 PM MDT

Write or call Wolff Gun Springs, the letter I wrote and the reply said they were not making springs yet but if enough interest was generated they may add them to the line up! http://www.gunsprings.com/

Let them hear from you and your needs. ${$default_wink_smiley}$

DAVIDF · August 23 2013 04:27:46 PM MDT

Thanks Shadow,

I called them, but the guy I talked to was very indifferent about it. Said they had lots of projects to complete first. I'll send them an email this time.

There are plenty of Gen 4 type RSA's available, but all of them I've seen have stock spring weights only. Wouldn't be hard for those manufactures to change spring weights.

Ezveedub · August 25 2013 12:21:14 PM MDT

I just checked the stock RSA in my Glock 20. It's the "072" marked one, which is the same as the Glock 21.

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DAVIDF · August 28 2013 09:44:52 AM MDT

The RSA in mine is the same.

I dropped off my 20 at my local shop to be sent back the second time. Let's see what happens. While I was at the shop I had the opportunity to compare the trigger on my Gen 4 to a Gen 3 (dry firing). I've always thought this was a great trigger. After comparing the two of them, I definitely prefer the Gen 4 trigger. It is lighter & crisper. Don't know if it is just this gun as I have not seen another Gen 4 20 in person.

Ezveedub · August 28 2013 05:10:48 PM MDT

Quote from: DAVIDF on August 28 2013 09:44:52 AM MDT
The RSA in mine is the same.

I dropped off my 20 at my local shop to be sent back the second time. Let's see what happens. While I was at the shop I had the opportunity to compare the trigger on my Gen 4 to a Gen 3 (dry firing). I've always thought this was a great trigger. After comparing the two of them, I definitely prefer the Gen 4 trigger. It is lighter & crisper. Don't know if it is just this gun as I have not seen another Gen 4 20 in person.

I haven't taken my G20 apart to check, but I was made aware that Glock has a "." connector now. It's supposedly comes on Gen4s and makes the trigger really smooth and clean. You may have it and that's why you feel the trigger feels better than the Gen3.

DAVIDF · August 29 2013 10:58:25 AM MDT

Yes, mine has the "." connector. I have 2 other Gen 4 Glocks, a 26 & a 17 which came with the "." connector. I have since installed the "-" connector & they are much better, but more over travel. The Gen4 20 as it comes has the best trigger by far.

Ezveedub · August 29 2013 11:50:31 AM MDT

Quote from: DAVIDF on August 29 2013 10:58:25 AM MDT
Yes, mine has the "." connector. I have 2 other Gen 4 Glocks, a 26 & a 17 which came with the "." connector. I have since installed the "-" connector & they are much better, but more over travel. The Gen4 20 as it comes has the best trigger by far.

I have to take my 20 and 22 down, as I didn't see any "." on my connector with the slide forward to examine the back of it. My 20 does have a smoother trigger than my 22 for sure. I heard the "-" in a Gen4 makes the trigger mushy I heard and its not recommended by some. I'll have to see when I get home. I have my friend checking his G20 and G23 Gen4 also.

DAVIDF · August 29 2013 01:57:39 PM MDT

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.