Posted: 2/19/2013 5:51:08 PM EDT
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This is not my gun so I do not have it in front of me. The question was asked by a friend of mine who sent me pictures. He says his brand new Glock 30 is leaving scratches on rounds when he chambers them. Gun is brand new and never shot These are the cartridges   I told him to check the ejector and extractor and he sent me these   Any input is appreciated guys Thanks
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| I don't think it's from the mag. because the scratches are the full length of the case. The barrel chamber are loose on Glocks so I don't think it would be from the chamber. Have him to remove the slide and see if he can see where the brass may be rubbing the underside of the slide. |
| I'm relatively new to pistols so I don't know the technical gun part name, but It should be the small rail inside the slide that rides along the rounds when they're sitting in the magazine, then as the gun cycles, it moves back, still pressing (and scratching) the rounds until it gets to the rear of the cycle then the round pops up just a bit so it can be pushed up the feed ramp. I don't think it's anything to be concerned about. |
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Some aftermarket magazines, specifically the Korean KCI ones, they have sharp feed lips and will scratch the cartridges like that. I've never seen sharp feed lips on a factory magazine, so if it's not that I'd check for a burr on the pickup rail of the slide.
There's a sharp spot on the slide right under the extractor claw that can cause that as well, it may protrude from the slide too far. The one picture you posted shows an actual chunk taken out of the case rim, only that protrusion on the slide below the extractor would do that. I would contact Glock about it. Here's a good picture of that protrusion under the extractor claw, on some slides it's bevelled back like in this picture but on some it's not: http://glock.pro/attachments/glock-tech-warranty/953d1300029122-breech-face-crack-dsc_1690.jpg |
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The scratches are from the magazine's feed lips. Brand new G21 and G30 magazines are known for being *extremely* tight when loaded to capacity. The strong spring pressure is causing the cases to dig into the metal feed lips during operation.
This is a complete non-issue. I know noobs like to endlessely fingerfuck new stuff and obsess over every little nick, high spot, and sound their gun makes, but it's best to just shoot and train with the gun. It's fine. Also, there are a lot of people that download their .45 Glock magazines by one round due to the high spring pressure. I personally do this with the G21 reloads I carry, as it offers a bit easier/ more reliable loading on a closed slide. If scratches in the cases of his ammo was really giving him heartburn that badly, he could try this. |