thecarfarmer
Member
A couple weeks back, I was at the range with some friends, and my EDC Glock 21 starts failing to cycle correctly. Went home and field-stripped. Extractor seems to move okay. Barrel and recoil spring assembly look okay. Manually cycling ammo through the gun, I find that more often than not, the back of the cartridge being extracted from the chamber drags across the top of the bullet that's next in line in the magazine. And then hangs up on the front of the brass of the round underneath it. This prevents the slide from moving backwards enough to allow the round to be ejected.
By racking the slide with main force, this can be overcome. But it takes a "seriously zesty yank" to do it. I've never had to do that before.
I found this to be the case w/ my JHP reloads, my ball reloads, and some other ball ammo I have here @ the house. I loaded a magazine w/ some lead ball ammo (to manually cycle), and you can definitely see a mark on the bullet where the rim of the round being extracted has dragged across it. So the problem doesn't seem to be just with one kind of ammo.
I have 4 mags for the gun; they all perform the same.
Speaking of magazines... if you drop the mag, or if there is no round in the magazine below the one being pulled out of the chamber, the gun ejects beautifully. Every time. Put one in the mag, and one in the mag... jam on extraction.
Some backstory about the pistol... it's an ex-police gun that I was told by the seller (bought off gunbroker) had had its frame changed as part of an update. I think it was a 2002 model. Anyway, I've put probably 1000 rounds down the pipe on it over the last year, and it's been dead-nuts reliable. Came w/ 3 of the 13 round mags (plus a buddy gave me another); all of them seemed to work perfectly well. And it's been fed a number of inexpensive brands of ball ammo (I haven't kept track, but I know for sure it's eaten WWB and Magtech, probably S&B and Fiocchi as I have had good luck w/ those in my Mak pistol) and never had a problem. I started reloading, and have put one or two hundred rounds of 230g ball and about 175 rounds of 185g JHP hand loads through it. The failure occurred w/ some of the JHP; same batch as a few dozen that operated flawlessly.
So, back to two weekends ago. I'm at the range; have probably fired 75-100 rounds through the gun w/o any issue. Then, the gun jams. The round doesn't go fully into battery; the slide is held maybe 3/8" back. So, I look at the gun, grab the slide, pull it back a half inch or so, and release; the round chambers and fires. Then a couple shots later, it does it again. So, I rack the slide and the round chambers; I rack it again to eject the unfired case for inspection. Couldn't see any problems w/ it. Happened a couple more times out of several shots, but the day was winding down. After field-stripping at home, cleaning and inspecting, I didn't see any problem; took the gun out again last weekend - same problem.
As I look at the gun, I suspect that this is because the gun was jamming on extraction/ejection and eating up so much of the recoil force that it wasn't leaving enough energy to fully slam the slide all the way back. Which caused the failure to feed. Because cycling by hand, I have had no problems feeding ammo from the magazine into the gun; it's always once the slide moves back to remove the round from the chamber.
Detail stripping and cleaning the gun has not seemed to make any difference.
So, any ideas on what this could be?
-Bill
By racking the slide with main force, this can be overcome. But it takes a "seriously zesty yank" to do it. I've never had to do that before.
I found this to be the case w/ my JHP reloads, my ball reloads, and some other ball ammo I have here @ the house. I loaded a magazine w/ some lead ball ammo (to manually cycle), and you can definitely see a mark on the bullet where the rim of the round being extracted has dragged across it. So the problem doesn't seem to be just with one kind of ammo.
I have 4 mags for the gun; they all perform the same.
Speaking of magazines... if you drop the mag, or if there is no round in the magazine below the one being pulled out of the chamber, the gun ejects beautifully. Every time. Put one in the mag, and one in the mag... jam on extraction.
Some backstory about the pistol... it's an ex-police gun that I was told by the seller (bought off gunbroker) had had its frame changed as part of an update. I think it was a 2002 model. Anyway, I've put probably 1000 rounds down the pipe on it over the last year, and it's been dead-nuts reliable. Came w/ 3 of the 13 round mags (plus a buddy gave me another); all of them seemed to work perfectly well. And it's been fed a number of inexpensive brands of ball ammo (I haven't kept track, but I know for sure it's eaten WWB and Magtech, probably S&B and Fiocchi as I have had good luck w/ those in my Mak pistol) and never had a problem. I started reloading, and have put one or two hundred rounds of 230g ball and about 175 rounds of 185g JHP hand loads through it. The failure occurred w/ some of the JHP; same batch as a few dozen that operated flawlessly.
So, back to two weekends ago. I'm at the range; have probably fired 75-100 rounds through the gun w/o any issue. Then, the gun jams. The round doesn't go fully into battery; the slide is held maybe 3/8" back. So, I look at the gun, grab the slide, pull it back a half inch or so, and release; the round chambers and fires. Then a couple shots later, it does it again. So, I rack the slide and the round chambers; I rack it again to eject the unfired case for inspection. Couldn't see any problems w/ it. Happened a couple more times out of several shots, but the day was winding down. After field-stripping at home, cleaning and inspecting, I didn't see any problem; took the gun out again last weekend - same problem.
As I look at the gun, I suspect that this is because the gun was jamming on extraction/ejection and eating up so much of the recoil force that it wasn't leaving enough energy to fully slam the slide all the way back. Which caused the failure to feed. Because cycling by hand, I have had no problems feeding ammo from the magazine into the gun; it's always once the slide moves back to remove the round from the chamber.
Detail stripping and cleaning the gun has not seemed to make any difference.
So, any ideas on what this could be?
-Bill