Glock G20 Gen4

[PHATSPEED7x]

Just got my box of Underwood ammo today. Inspected every round and found this...



Looks like bullet was seated at an angle and bent case and bullet. Sent them an email to let them know what I found and if they could do anything for me. Hopefully will hear back from them tomorrow.

Sent from LG G2

[Seismic Sam]

Hmmmm... whadda ya bet that the same precision that they seat bullets with is the precision they use for measuring the powder?? They'll probably send you a free box of 10mm ammo to shut you up. Unfortunately, that's like getting a "freebie" from a hooker who already gave you the clap!! Wanna try again??

Plus there is this gem of a disclaimer from this fine company:

Cannot be used in Colt Delta Elite or any other firearms with rampless barrel due to complete lack of case support.
Safe for use in all 10mm firearms with a ramped feed barrel. (Examples: Glock, EA Witness)


So a Delta Elite doesn't have full chamber support because of its lack of a ramp, even though that's the standard 1911 design, but a Glock (especially the earlier generations...) DOES have full chamber support??? Gee, that claim wouldn't have anything to do with the fact that Delta Elites account for .001% of the market while Glocks account for a double figure percentage?? I'm calling aggravated class A Felony BS here...

[Rodentman]

So I shouldn't use that ammo in this:

Don't worry I won't.

[PHATSPEED7x]

They offered me $5 off my next order... I'll have to see how it runs in my model 20...

Sent from LG G2

[Seismic Sam]

They offered me $5 off my next order... I'll have to see how it runs in my model 20...

Maybe like this?? http://www.thefirearmblog.com/blog/2011/11/16/glock-20-10mm-auto-kaboom/

And as you can clearly see here, Glock chambers FULLY support the cartridge case while those shoddy Colt Delta Elites don't, so you can shoot that overloaded Underwood ammo in the Glock with no problem!!
Yes, I know this is 45 ACP ammo and not 10mm, but considering that the SAAMI limit for 45 ACP is about 21,000 PSI and for 10mm 37,500 PSI, it shows what can happen even for a low pressure cartridge, much less a 10mm...

[PHATSPEED7x]

Just shot the 10mm for the first time. The critical duty was a little snappy. But not like I thought it would be. I've shot +P 9mm that had more recoil.

The Underwood ammo was some hot stuff. Really felt the snap from each shot. You swore you were shooting a magnum revolver. Only other handgun I've shot that compares in recoil is my LCR. But the Glock is more manageable.

This is my new favorite high power high capacity carry gun now. I got my badger concealment IWB kydex holster for it today.






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[Seismic Sam]

Just for S&G's, take a close up of a 10mm round sitting in your Gen 4 Glock barrel from the underside of the feed ramp and post it so we can see how close it is having full support.

[Doc Harvey]

[Seismic Sam]

Thanks, Doc!! While the Glock Gen 4 case support is a lot better than an original Colt Delta Elite barrel:



it looks to be NO BETTER than a Glock Gen 2 10mm barrel shown on the left:



that produces a bulge this big:



Finally, NONE of the above satisfy what Underwood claims that ALL Glocks do, and that is provide FULL chamber support such as this EAA barrel:



Now let's be clear: I am in no way bashing Glocks here, but I am saying that the Underwood disclaimer is complete hogwash, and in 10 minutes on the internet you can find pictures like these that prove it!! And this is from a company that sends out ammo with gross defects as shown in this thread, and velocity levels that are higher than the published data in ANY reloading manual ever printed, or the factory specs of any other 10mm load that doesn't have a disclaimer concerning case support of the 10mm cartridge. Do you REALLY want to put your own safety and health on the line when it's clear that their own disclaimer is including guns (for the sake of Underwood selling more ammo) that clearly do not meet their OWN criteria for "full case support"?? And they're going to give you $5 off on your NEXT order after sending you a cartridge which is THAT defective??? Well, we're back to the analogy of the hooker who gave you a dose, and is now promising $5 off on the next time you come back to see her... Good luck with that box of ammo, and I hope you can shoot the whole thing with no problems. If it were me with a brand new gun, I'd think twice about shooting that stuff and just chalk up the $40 lost to experience and buy something else.

P.S. After having a beer and reflecting on the above post, I realized I had missed something interesting - the text below is a direct port of the text on the Underwood site itself:

Cannot be used in Colt Delta Elite or any other firearms with rampless barrel due to complete lack of case support.
Safe for use in all 10mm firearms with a ramped feed barrel. (Examples: Glock, EA Witness)

Gee, isn't it EAA Witnesss? Apparently the proofreading of their legal disclaimer statements is exactly the same quality as the QC standard for their ammo production....

[Doc Harvey]

Nice looking rig, Phatspeed7x! Let me know if you're looking for an OWB kydex holster for your G20!

[PHATSPEED7x]

Sent from LG G2

[brad3579]

Just for S&G's, take a close up of a 10mm round sitting in your Gen 4 Glock barrel from the underside of the feed ramp and post it so we can see how close it is having full support.

Here are close up barrel and spent Underwood 180 gr casing pics.

[Seismic Sam]

Cases look OK, primers are flat, but not excessively flat, so those 180 loads look like the max but not over the edge. I've reached 1300 with 180's in my EAA and my Delta Elite, and that's exactly where I stopped. The load that Underwood has that is scary is a 200 grain 1250 FPS load, and you couldn't pay me to shoot that in a Glock OR Delta Elite. 200 grains at 1200 FPS was the original spec, and was considered hotter than hell, and it did in a number of the early 10mm pistols that are no longer around. While going 50 FPS faster doesn't sound like much, you have to work up to 1200 FPS before you realize how far out on the limb you are, and what's likely to happen if you push it any farther. I got to 1400 with 165 grain bullets, and two tenths of a grain beyond that I got two bulged cases, even though my chrono didn't indicate any larger velocity jump at all. I consider myself lucky that I got a warning before the gun blew, and that's the thing about the 10mm: It's hot enough that if you go over the edge it may let loose on you with no warning at all. If you keep a close eye on your fired cases as you shoot them, the 180's will probably be fine, but look out for that 200-1250 loading.

[PHATSPEED7x]

I did some shooting of my Glock 20 yesterday with underwood ammo. I was having trigger reset problems. Gun would fire but the trigger wouldn't reset. Got two rounds to fire then the trigger wouldn't reset. I tried to get the trigger to reset by working the slide by hand and I could get it to reset every other rack.

Did some research on Glock talk and this is a common issue with the gen4 and hot ammo. I also saw that most guns that were having this issue had a 3.5# connector installed. The slide was being blown back so quick the connector was actually being bent. I reinstalled my factory 5.5# connector. The trigger feels better now. Going to test fire it this afternoon to see if it works now.

[farmer44mag]

Sorry to resurrect this old thread but havn't checked in here in a while. Did going back to the 5.5 pound connector fix the issue?