Glock 20 Gen 4

[chucky2]

PandaBear, what makes you say that about the followers?

[10mm-Admirer]

My G20SF does exactly the same thing with the higher impulse hot boutique ammo (PBR 200 XTP) but not with max reloading book loads or lighter.  I was discouraged, like you, at first until I started using more reasonable loads and the feeding problem disappeared.

The PBR 200 XTP ammo I shot was way too hot IMHO.  The brass was rough looking after being fired and a factory Glock barrel would produce smiles.  The KKM barrel didn't.  The primer pockets were loose when I reloaded them.

Hang in there.  Best wishes.

[The_Shadow]

Do you have any more of the offensive PBR 200XTP?  If you were to send me one, we could do the Pull-Down and document that load.  The 200XTP was not documented yet.  PM me if you want to send me one for pull-downs...we can all learn from the data documentations.  Thanks!

[PandaBear]

Lots of people including myself have had problems with the 9mm 2183 followers which is why I decided to order a 10mm2 follower to try out. Might as well give it a try.

I have no smiles or bulges on any of my cases and cases eject as they should.

[ninja]

I plan to order this LaRue Tactical mount, fitting into the rear factory dovetail: Glock Aimpoint Micro Mount | LaRue Tactical  for an Aimpoint Micro H-1.  With the added weight I'm hoping to slow the slide while running the hot Underwood...  hopefully mag feed timing will benefit too.

[PandaBear]

Update

Replaced the extended slide stop with the original slide stop and loaded 2-3 rounds per mag.

20 rounds UW 165 TMJ
2 rounds UW 150 JHP

Slide locked back with 1 round in the mag using factory 10 round mag with original spring.
I couldn't even tap, rack, bang because the gun thought the mag was completely empty.

Put the Wolff 10% spring in and had 0 issues.

I watched a video on youtube called "Biomechanics Of The Grip" and it taught me that I wasn't applying sideways pressure with my hands properly.

Further testing is required though...

[The_Shadow]

"Biomechanics Of The Grip"

[TXCOONDOG]

Was having the same issues with the last round getting picked up until I drop my 180gr loads to  1200 or less and my 200-220 gr loads to 1130 or less (1050fps).

However, not picking up the last round on hot loads is my least concerns if I need that many

[redbaron007]

This weekend, I was able to run through some UW ammo, 180 xtp and 155 Nosler......had no feeding issues with the stock barrel or new KKM.

[chucky2]

So PandaBear, you are thinking it was your grip causing the FTF or the lack of spring pressure (which itself may have compensated for something else wrong, like the frame flexing or something else)?

[PandaBear]

I'm thinking it's a combination of my grip, the flex in the frame, and the factory magazine spring not being strong enough.

The slide locked back with 1 round in the mag with the factory spring.
The slide didn't lock back with 1 round in the same mag with the Wolff 10% spring.
I only load 2 rounds into the mag each time.

The slide has never locked back with more than 1 round in the mag.
I shouldn't call it a FTF issue since the last round is barely being pushed forward out of the mag.

[PandaBear]

Put 14 more rounds of UW 165 through my 15 to 10 round magazine and the slide locked back with 1 round left in the mag only 1 out of 7 mags. Seems as if my grip is to blame.

[chucky2]

Here's what's interesting on the grip thing:

When I talked to Glock after they sent mine back saying they found no problems, they said they fired it using like 3 fingers or something like that to simulate an extreme limp wrist condition - and it worked for them.  Of course, we now know they used weak 10mm ammo, so not really the same as what we're shooting.  But the point remains, to me, it sounds like Glock expects the firearm to function even when limp wristing.  If that is true, then shouldn't it still function despite a not perfect grip?  What if you're in a struggle with someone and you have one hand on the firearm and need to fire?  It is not expected to perform in such a situation?

[4949shooter]

Put 14 more rounds of UW 165 through my 15 to 10 round magazine and the slide locked back with 1 round left in the mag only 1 out of 7 mags. Seems as if my grip is to blame.

I am still banking on that magazine.

[Sean from Vt]

This is an interesting topic. As I posted in my introduction I just bought a "used" Gen 4 G29. I say "used" because honestly there is no wear anywhere on the gun that suggests that it was shot much by the previous owner.

Anyway, yesterday I got the chance to take this pistol to the range. With me I took an old box ($14.95/50) of PMC 170 gr JHP, a new box of Remington 180 gr Metal Case, and two handloads. The two handloads used Berry's
155 gr Plated Bullets, brand new Starline brass and 7.0 and 7.5 grains of WSF. I shot 10 rounds of the PMC JHP's, then 10 rounds of the Remington load. Then I loaded a mag with 5 rounds of the 7.0 gr load. The slide locked
back after the 4th round. After firing that 5th round I ran through 5 rounds of the 7.5 grain load with no problems. Then I ran another 10 of the Remington through the gun with no issues. Then I loaded 8 in one mag and 7 in
another of the 7.0 grain load and the side locked back with round to go in the first mag but then I had no problems with the other mag. Thinking I had narrowed it down to a mag issue I loaded the questionable mag with 8
rounds of Remington and had no issues with that mag. So, I did the same with the PMC and had no issues either.

Now, 7.0 grains of WSF is a very light load (Hodgdon lists 6.8 grains as giving 1100 fps) so it seems I kind of am having the opposite experience from Panda where light loads are giving me issue where the 7.5 grain load did not,
and neither did the factory ammo.

Was it just me? It's been several years since I have shot a Glock but I do shoot regularly-1911, M&P, 44 revolver etc.