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

[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. 

[DAVIDF]

The_Shadow,

Thanks, everyone on this forum has been great and very helpful.  Despite my issues with this gun or maybe because of it, I've learned a lot about 10mm's both the guns & ammo.

Yes, definitely frustrated. I think it may in fact be worse since I got it back from Glock.  Before I sent it back to Glock,  it was working with everything I tried in it including 200 gr fmj velocity supreme from PBR with the Gen 3 spring. Now, it is not even working with the Gen 3 spring! On the bright side, It has been absolutely the most accurate, best trigger, & most reliable with light to mid-range loads of any Glock that I've fired. That is why I wouldn't hesitate to give it to my daughter to use. Plus I've got a bunch of ammo for her to train with.

[Intercooler]

Any Glock expert around you could work with swapping things? I think If it was under warranty it would go back again and again until right!

[pacapcop]

Or replaced, which should be done at this point. Just saying. Heck, they should offer up a Gen 3 for him.

[DAVIDF]

Yes, asked about replacing the gun. Rather sarcastic response from the Glock rep I spoke with who defined Blazer ammo as "heavy." And, that is the only thing they will test it with or something similar. I've already told them that it's had plenty of Blazer ammo thru it & no issues with that. Don't know any Glock experts in the area. Probably is being that I'm in a pretty big metropolitan area.

[pacapcop]

That is sad when a rep thinks Blazer is heavy. Makes for starting to get an issued resolved break out the spirits.

Where was the gun purchased from might i ask?

[DAVIDF]

From Shootstraight in Apopka, FL. Big store with a number of stores in Florida.

[pacapcop]

Do they have their own warranty?

[DAVIDF]

No, not like Davidson's.

[REDLINE]

Rather sarcastic response from the Glock rep I spoke with who defined Blazer ammo as "heavy."

I'ld like to think he was just referring to the heavy 200gr bullet.  Could he seriously have meant they average anything over a 30,000 PSI load, let alone 35,000-37,500 PSI load? 

I would like to ask the same rep what he considers lite.  I think the weakest factory 10mm load in existence may be the Federal Hydra-Shok.

[DAVIDF]

Redline,

Yes, he was thinking of bullet weight. But he couldn't seem to grasp the concept that just because the bullet is heavy it doesn't mean the recoil or pressure is heavy or high. He did not seem to understand ballistics, recoil, pressures, etc. I explained to him that the gun wasn't working with a PBR load of 200gr with a velocity of around 1250 fps and that the gun worked perfectly fine with 200gr Blazer at a velocity of about 200 fps slower. He kept stating over and over that they tested the gun with 105 round of Blazer with no malfunctions.

You would think that Glock, with the current state of our economy, would be able to hire employees that have a fair knowledge of ballistics. Or at least would be interested enough to educate themselves from watching youtube!

[REDLINE]

WOW!  I feel for ya.

I'm opposite that Glock rep...I know lots about ammo but little about guns.  Too bad he wasn't willing to listen to your sound reasoning.

You should have told him you wanted to speak to his supervisor.

[DAVIDF]

At least the first guy I spoke to at Glock seemed knowledgeable. He flat out told me that they don't recommend shooting the hottest ammo such as Buffalo Bore & that they would not test my gun with ammo that heavy. He was helpful & honest.

[DAVIDF]

I watched part of an episode of Tac-TV last night with Larry Vickers, Ken Hackathorn, & Dave Spaulding. Ken & Larry were talking about how some Glocks in 40 S&W flex (particularly with lights mounted) & aren't as reliable as the 9mm's. Ken explained how the front of the frame flexes & causes the slide to slow as it is returning to battery causing failures to feed.

The Gen 4's have more of the frame cut out to accomodate the larger diameter double springs. I wonder if the Gen 4 Glock 20's are more prone to this issue? Maybe this is why mine does worse with heavier springs as the slide is of course moving forward even slower.

[REDLINE]

I don't know.  Of course I have a Gen 3, but I'm always keeping an eye out for ways to slow the slide down, at least for the loads that end up with brass ejected into the next zip code.