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Discussion Starter · #23 ·
It's not a tool mark. It's a broken piece of plastic in an insignificant area. Looking at it, it is miniscule. I get why someone would ask but it isn't an issue.


That piece of plastic that is broken off has NOTHING to do with the integrity of the gun.
That is not the plastic frame. It is the metal slide where the recoil spring seats into. While the crack does seem to be insignificant, the location is actually an important spot. If it breaks there the entire pistol is inoperable.
 

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It's not a tool mark. It's a broken piece of plastic in an insignificant area. Looking at it, it is miniscule. I get why someone would ask but it isn't an issue.


That piece of plastic that is broken off has NOTHING to do with the integrity of the gun.
I thought it may have been a tool or machining mark because if you look right beside it you can see one. And OP said the mark also appears on the replacement pistol.

It's also metal. If it were a G44 slide I would agree it was plastic, but it's not. :p
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It's not a tool mark. It's a broken piece of plastic in an insignificant area. Looking at it, it is miniscule. I get why someone would ask but it isn't an issue.


That piece of plastic that is broken off has NOTHING to do with the integrity of the gun.
What plastic part are you looking at?
We're talking about the area of the frame on a G20/21 that has the gap or chip where the RSA sits.
Notice the G21 photo in Post #1 with the circled area, and Post #3 with a photo showing the same area on a G20.
 

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Discussion Starter · #28 ·
As an update, fired hundreds of rounds out of the replacement, and it fired flawlessly. The “chip” has not seemed to progress whatsoever if it is one. I’m probably going to keep the replacement, but I am curious whether or not this is an actual defect.

Any others with a gen 3 glock 20/21?
 

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First off, yes, it is a defect. If it's smooth inside, then someone at Glock polished it before the finish was applied, assuming there is finish inside the chip. If it's shiny, it's something that broke while you were shooting it. However, I wouldn't do more than keep an occasional eye on it to make sure it doesn't develope into a crack, which given the location is very unlikely. It's not exactly a high stress area. Basically, I wouldn't worry about it in the least!
Cheers,
crkckr
 

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No marks like that on any of my dozen+ 20/21/29/30/40 SF and non SF. Almost all gen 3.

Just out of curiosity, if you have a chip like that in there, did you ever shoot anything other than factory ammo or use a non flexing guide rod? If you did only use factory ammo, did you shoot regular run of the mill 10mm or full on power loads like buffalo bore and the likes? After market barrel? I did have an after market barrel do a number on the slide of a 19.
 

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Maybe that spot is where the rsa possibly rubs as it tilts with the barrel during recoil?
The end of the rsa has a sharp corner where the spring ends. Maybe these two spots are connecting.
 

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I had a glock 21 gen 3 that I’ve had for under a year with few hundred rounds through it. Upon inspection during cleaning, I found a couple small nicks/chips on the inside of the slide (one in the rsa ring area, and one on the stripper bar). Seemed fine functionally, but it did bother me it being a brand new gun, so I contacted glock and they replaced the entire gun (they were out of stock of slides).

The strange thing is the replacement has a “chip” in one of the exact same areas as the one I sent in. This makes me wonder if it is either a chip at all or if it is intentionally there. Can anyone who has a new or well kept glock 21/20 gen 3 check this area to see if it is a chip or not? My glock 26 does not appear to have this so it is very confusing.


View attachment 1113370
View attachment 1113369
@Nabi,
Here's my G19 Mariner, with a pic of the same spot. This is a Gen3 pistol. It is my personally-owned spare G19 that mirrors my work issued weapon. This Glock has about 20,000 rounds through it, all company furnished +P+ ammo.
Funny how the G20/21 has the ding and the G19 doesn't. View attachment 1113450
View attachment 1113449
I will be looking at mine after that picture soon,tx
 

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Discussion Starter · #34 ·
No marks like that on any of my dozen+ 20/21/29/30/40 SF and non SF. Almost all gen 3.

Just out of curiosity, if you have a chip like that in there, did you ever shoot anything other than factory ammo or use a non flexing guide rod? If you did only use factory ammo, did you shoot regular run of the mill 10mm or full on power loads like buffalo bore and the likes? After market barrel? I did have an after market barrel do a number on the slide of a 19.
The marks in the barrel ring area was there in both glock 21s brand new. The replacement glock I received is from an entirely new lot based on the serial number, separated by over a year in manufacture dates. It still has the same mark/chip on it brand new before firing.
On the glock I sent in for exchange, it had few hundred rounds of fmj, and a hundred or so +p JHP rounds. The only part that touches that area is the barrel as it unlocks and tilts, as well as during barrel removal/installation. No steel rsa, only oem.
On the newer one it is much less noticeable, and has to be viewed at the angle I am holding the slide in the OP to see unless you have reading glasses on. So it seems less like a chip and more like a machining mark, but not entirely sure. The shape and location is the exact same, just a smaller hemisphere shaped mark on the replacement glock.
 

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This is my 1993 Gen2 G20. Looks fairly similar to yours. Sorry for the dirty appearance but today was range day.
Oh, and this is how mine looks after roughly 150,000 rounds through it. I bought it new and have shot it almost weekly since then. Hope the pic helps! View attachment 1113412
How dare you use your Glock and make it dirty…jeez…
 

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I had a glock 21 gen 3 that I’ve had for under a year with few hundred rounds through it. Upon inspection during cleaning, I found a couple small nicks/chips on the inside of the slide (one in the rsa ring area, and one on the stripper bar). Seemed fine functionally, but it did bother me it being a brand new gun, so I contacted glock and they replaced the entire gun (they were out of stock of slides).

The strange thing is the replacement has a “chip” in one of the exact same areas as the one I sent in. This makes me wonder if it is either a chip at all or if it is intentionally there. Can anyone who has a new or well kept glock 21/20 gen 3 check this area to see if it is a chip or not? My glock 26 does not appear to have this so it is very confusing.


View attachment 1113370
View attachment 1113369
I think your slide is fine and that this machining mark is unique to Gen 1-3 large frame slides. My G21.3 has it. Purchased it new in 1999 but I don't shoot it much; only has about 3,800 rounds through it!


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Discussion Starter · #40 ·
I think your slide is fine and that this machining mark is unique to Gen 1-3 large frame slides. My G21.3 has it. Purchased it new in 1999 but I don't shoot it much; only has about 3,800 rounds through it!


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View attachment 1114891
Looks newer condition than mine! Must be the tenifer finish. Yea it looks like its on pretty much all the earlier gens. Thanks for the pics!
 
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