New to me Gen 3 G21 question. [Archive] - Glock Talk


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11-16-2012, 10:06
I purchased a used G21 yesterday for a really good price. According to the serial number research project, this pistol was born in may of 2000. Being 12 years old and having an unknown round count, are there any specific areas that I should inspect for parts that need replacing?

I completely disassembled the slide to thoroughly clean it. It was covered in oil and the striker pin and channel were soaked. I didn't see anything abnormal in the slide or it's components.

While cleaning the barrel, I happened to notice some discoloration within the chamber. This discoloration spans from roughly the 8 o'clock to 10 o'clock position within the chamber. 229078
I had assumed this to be normal, but wanted to ask and confirm to be certain.

And here she is as I received her.

Thanks in advance for any input.

11-16-2012, 10:24
Make sure you have the firing pin channel thoroughly cleaned out....doesn't need any (or very very little) lubricant in it.

As for the discoloration, is the metal actually changed colors or is it more of a rub mark. Just from the photo, I'm taking a wild guess; it looks like the empty case maybe rubbing the side when being ejected...or the mags/barrel have an alignment problem and it is rubbing the side when loading.

If you know a Glock Armorer in the area, you may have them look at.



11-16-2012, 13:24
I cleaned the striker channel very thoroughly. Even disassembled the striker itself and scrubbed it free of oil/moisture of any kind.

I can't undoubtedly confirm or deny that the mark is/isn't being caused by the case rubbing the chamber. Here's what I can confirm though: I ran my snap caps (machined metal) through the chambering/extract/eject process approx 100 times without issue. No marks on caps or chamber.

Took this pistol to the local range. Fired 50rds of Magtech 230gr range ammo. No issues. Accurate. Inspected spent brass. No abnormal bulging or markings of any kind. 229091

11-16-2012, 13:34
Very good news. :thumbsup:

I'd just inspect your brass a few more times, just to see if there is anything abnormal shows up.

You definitely want to keep the channel cleaned from oil and grease/lube......if not, it will be a magnet for debris.

Good shooting! :cool:



Bruce M
11-16-2012, 13:49
Good to hear your G21 seems to still have alot of life left in it.

11-16-2012, 18:55
I recently acquired a used G21 with a birth date of 1998. Previous history is unknown to me but it looks like it's been used. It passed all function tests and fired fine, but just for peace of mind I changed out the recoil spring assembly and extractor spring. These parts are only a few dollars and I keep the used ones for spares.

11-16-2012, 19:23
Nice gun! The G21 was my first Glock and I love it. I hope you enjoy it as much as I do.

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11-16-2012, 19:25
Congrats on your G21!:cool:

11-19-2012, 19:43
What are the chances that a previous owner used steel cased ammo and it wore off the finish in the chamber? Or perhaps that the grey area in the chamber is the lacquer left behind from steel casings?

11-19-2012, 22:48
Mine looks the same. It's normal and the tenifer wore off that area is all.

11-20-2012, 01:47
Sounds like you've covered your bases nicely but agree with Red, keep an eye on the cases from the next 100 rounds just to make sure. (I couldn't tell if anything was wrong from the pic.) If you have any doubts, take it to a certified armorer for inspection.

Congrats and enjoy!