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

[DenStinett]

When my love affair started with the 10mm years and years ago when it first got introduced I got my self a colt delta gold cup 10mm and it was the BIGGEST piece of crap I have ever had.  I too had to sell it off

NO ! ! !
Say it isn't so ! ! !
I felt the same about my G20 ("BIGGEST piece of crap I have ever had") and traded it for my Delta Gold Cup
Wouldn't own another Glock if it was given to me
To each his own I guess

[pacapcop]

Would it be fair to say the Gen 4's are suffering along the lines of a new car model syndrome. It happens when change occurs. It can be good or bad. Not just the 10mm either.

[445 supermag]

When my love affair started with the 10mm years and years ago when it first got introduced I got my self a colt delta gold cup 10mm and it was the BIGGEST piece of crap I have ever had.  I too had to sell it off

NO ! ! !
Say it isn't so ! ! !
I felt the same about my G20 ("BIGGEST piece of crap I have ever had") and traded it for my Delta Gold Cup
Wouldn't own another Glock if it was given to me
To each his own I guess

Dont get me wrong I would of NEVER sold the gold cup if it worked.  Its not like I hated the gun I didnt I just hated it NEVER FUNCTIONED at all.  Thats all.

[USMC0341]

My G20 gen 4 functions flawlessly have been firing target ammo as well as numerous underwood selections without issue, it is completely stock as of now, I have ordered a Rachis recoil system and both 22lb and 24lb springs as the stock RSA allows for some frame battering, have also ordered aftermarket barrel because of increased chamber support though it does not seem to be too much of an issue on the gen 4 I get slight case bulge but no smileys and the bulge is not substantial

[445 supermag]

Welcome USMC

Glad you like your G20 10mm.    I love mine and cant shoot it enough.

Brian

[DAVIDF]

USMC0341,

Thanks for mentioning the Rachis rsa. I wasn't familiar with it & I've been waiting for someone to come out with a Gen 4 specific rsa with heavier springs. Looks very good especially as it is not captive. I may order one.

My Gen 4 works perfectly with everything as long as I use a Gen 3 rsa & an adapter from Glockstore. So I have decided to keep it.

[DAVIDF]

USMC0341,

Where did you find the 22 & 24 lb springs for the Rachis? I talked to someone at Brass Stacker today & they told me only the 17lb is available.

[DAVIDF]

I ordered a Rachis guide rod (lite carry model) & 17 pound spring that comes with it. I'll try this & see if it works with Underwoods 200 gr xtp.

[REDLINE]

My G20 gen 4 functions flawlessly have been firing target ammo as well as numerous underwood selections without issue, it is completely stock as of now, I have ordered a Rachis recoil system and both 22lb and 24lb springs as the stock RSA allows for some frame battering, have also ordered aftermarket barrel because of increased chamber support though it does not seem to be too much of an issue on the gen 4 I get slight case bulge but no smileys and the bulge is not substantial

I hadn't heard of the Rachis recoil system either.  Thanks for bringing it up and welcome to the forum!

[DAVIDF]

I spoke with Kyle & Terry Rutherford of Brass Stacker at length about the Rachis RSA & everything imaginable including where we grew up, weather, declining number of places to shoot, etc. Very nice guys & extremely helpful. Kyle wanted me to call him back with a review of the Rachis & let him know whether it resolved my problems. He also said to return it if it doesn't help. They truly want their customers to be satisfied.  I can't imagine a company with a more friendly staff or one that is more interested in helping their customers. I received the Rachis recoil system yesterday. Very nicely packaged product. Looks like an excellent system for Gen 4 Glocks.

I tried it on my Gen 4 Glock 20 this morning. Although, I believe it to be an excellent product, it didn't help with my issues. I was experiencing failures to feed with Underwood 200 gr xtp's with every spring combination I have (stock Gen 4, stock Gen 3 with an adapter from Glockstore, tungston guide rod w/22lb spring & adapter from Glockstore, & Rachis w/17 lb spring).

The Rachis worked flawlessly with everything else and I believe it is an excellent rsa. The adapter fits perfectly into the slide. The guide rod & spring fit perfectly into the frame. I may put one in my Glock 17.

At this point I will be either trading the gun for another Glock (of undertermined mode) or giving it to my daughter for use with lighter loads than Underwoods. She will try it next weekend and see if she wants it. If I purchase another Glock 20, it will definitely be a Gen 3.

[The_Shadow]

David, thanks for your report and sharing your experiences...I know this is going to sound crazy, but I wonder if the newer gen4 slides weigh less than previous generations?      If the mass is less, then the impulse could be too great despite the RSA.  Do you know someone close that has a gen 3 Glock 20 to compare slides visually and or by weight?  Just a thought?

[Intercooler]

   Sorry to hear this! This is about the weirdest gun issue I have seen in a while. One of the Witness pieces would serve you well I would think.

[pacapcop]

DavidF,the Gen 3 I have is a work horse. Look forward to your report when you get one. I am actually planning on another, just gathering the funds. 20 and 22lb springs and steel guide rod, all from Wolff.

Medium loads are fine with stock setup.

[DAVIDF]

Shadow,

No one that I know has a Gen 3. I've handled a couple in gun shops & taken them apart. Slides seem to be the same except for where the guide rod fits at the end. Seems to be the same weight, but haven't weighed them.

pacapcop,

Yes, the Gen 3 look to be the way to go. I bought this particular Gen 4 because the trigger is phenomenal. Should have bought the Gen 3 that was in the same display rack!

[The_Shadow]

David if we were close, I let you try the slide from my 3rd gen 20SF if they would swap, to see if it would run.  Or I could study   the ammo more closely to see if adjustments to COL would help.  I know you have to be frustrated.