The breechface groove in Gen5 Glocks

[feudist]

Do those significantly improve ejection?

Would it be worth it to do it to a Gen4?

Or is that PII?

[call_me_ski]

Glocks are commodity guns. You are way over thinking things. Does it improve it? yes. Do the Gen 4 guns work without it? Yes. Just buy a Gen 5 if you want to.

[RJ]

How good/bad is the ejection on your gen 4 now?

[Lost River]

Are you having ejection problems with your g4 now?

If its not broke..

[ralph]

If you want vigorous 100% ejection to the right, so that it throws the cases about 7-8’ away from you, buy a Gen 5, If on the other hand you’re happy with the pistol throwing cases to the right, left, straight up, forward, or over your shoulder, or in your face, then, buy a Gen 3,4,Glock... After having numerous Gen 3, 4, G19’s, G21’s all of which had ejection issues, and only two saw a significant improvement with a Apex extractor, For me, as far as Glocks go, I won’t buy anything but a Gen 5, with the breechface cut..

[GJM]

If you like to shoot in short sleeve shirts, the new breech face cut is desirable.

[HeavyDuty]

I’m actually surprised we haven’t seen smiths offering the breechface cut. In my personal experience guns with the cut significantly outperform the ones I have without. I wonder if the cut would have salvaged my old 36...

[ralph]

I’m actually surprised we haven’t seen smiths offering the breechface cut. In my personal experience guns with the cut significantly outperform the ones I have without. I wonder if the cut would have salvaged my old 36...

Or better yet, Why doesn’t Glock offer this as a retrofit for Gen 3,4,pistols?

[Sig_Fiend]

The breechface cut is a significant improvement for consistency and robustness of both extraction and ejection in Glocks. The thing I think many people don't realize is that Glocks without it (gen 1-4 and early gen 5, for the most part) are always on the ragged edge of barely extracting or ejecting. That's just my opinion. They work and are generally reliable a majority of the time, but that doesn't necessarily mean they are great at performing those two functions of cycle. They can be better. Here's some vids to demonstrate the point:

G19.3: https://www.youtube.com/watch?v=tBHkGaWU1Lg
G34.3: https://www.youtube.com/watch?v=4uotsMABUb4
G17.4: https://www.youtube.com/watch?v=CbgrioNpJSA
G17.4 and G23: https://www.youtube.com/watch?v=IOAtSPHmgwU
G23: https://www.youtube.com/watch?v=QM_30OHgfNA
G19X: https://youtu.be/Alr6mjmzKGs?t=132
G20: https://www.youtube.com/watch?v=ABBfc_uq_Is
Custom G19 (appears to be a gen 4): https://www.youtube.com/watch?v=hkrX6BVO8xc
Suppressed G19.3: https://www.youtube.com/watch?v=klnKLqlq2e8
P80 + RMR + Comp: https://www.youtube.com/watch?v=sWWtQdU1c8Y (I know, far from OEM or stock, but interesting nonetheless)

Some of those may seem irrelevant, but the interesting thing to note is some of the common characteristics across models, calibers, and configurations. For one, the brass appearing to often slam into either the breech face or front of the extractor sideways as it's ejecting. Another variant of that is the brass contacting the right side of the lowered ejection port wall, causing the brass to achieve a significantly vertical arc. Also, pretty frequently you'll see brass just dribbling out of the ejection port as opposed to being flung a fair distance of several feet or more. Generally all things that aren't confidence inspiring.

Contrast that with a well-tuned 1911 extractor and ejector. Here's Hilton Yam with several Staccato 2011's and a G19.5. Notice across all of these, including the G19, the consistency of the pattern or arc of ejection. Personally, THAT is what I want to see from a gun, but I am weird.
https://youtu.be/Rf12GnB27tI?t=422

For improving extraction or ejection on older Glocks a few common options are:

• Apex Tactical extractor
• Glock 30274 ejector (for 9mm only) (Sometimes you can find the ejector-only on eBay, but generally have to buy a gen 4 trigger housing from most places.)
• White Sound Defense H.R.E.D. extractor plunger: 9mm, .357sig/40sw
• Test with hotter/better quality ammo like: Speer Lawman, Winchester NATO (Q4318 or other brand at proper NATO spec), Federal HST, Speer Gold Dot, anything from Black Hills, etc.

[feudist]

Mine does ok. I'm left handed so from Gen2 on, I've always caught a piece of brass here and there, especially shooting on the move to the right.

I'm deep in Gen1-4 parts and have 2 Gen 4s set up,and as far as I can tell the improved ejection is the only change that affects me.

I took a rasp to the fingergrooves, and undercut the trigger guard, also thinned it where my finger was dragging inside. I painted the inside of the magwell orange

so reloads are easy.

I couldn't shoot a 2" group on demand if Haile Berry was the prize, so the improved barrel means nuts.

I don't know.