Glock 19 Blowback

S

Sid K

New member
I have recently had five cartridge cases to rupture adjacent to the ramp in my Glock 19. I was using light hand loads (4.6 grs of Win 231 with 115 gr JHP). No damage to the gun that I can see but it's raising cain with my trigger squeeze. I've checked everything and can find no possibility of an error in loading. Can't see anything wrong with the gun, but ain't gonna shoot it no more til I find out what the problem is.
 
Questions:
1) 5 cases out of how many?
2) How many times have you reloaded these cases? ie. Is it new brass?
3) As stated above, does this happen with factory ammunition?
It might be a good idea to have your friendly neighborhood Glock armorer look at your gun anyway. :)


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I have never shot factory loads in this pistol. I had probably shot 3000 rounds before this problem started. The last blowback was with once fired Winchester brass. Three of the previous blowbacks were with military brass. I don't know how many times they were fired. I gage every round and discard brass from any round that is deformed in any way. None of the blowbacks were from deformed brass. The five blowbacks occurred during the last 300-400 rounds. <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by PreserveFreedom:
Does this happen with factory loads?[/quote]
 
I'm sure the pistol was completely in battery on two of them because they were first rounds of the string. I'm confident that the others were ok also because I never have trouble with this gun going all the way home. I have a theory that I'd like some comments on.
I've noted that if you place an empty cartridge case in the chamber and remove the magazine you can see a small crescent of exposed brass where the ramp meets the chamber. This is where the cases are failing. I suspect that after the brass has become weak from several sizings it simply fails in this unsupported area. I though this theory was shot down because the last failure was supposedly with once fired brass but on reflection I'm not sure that it was once fired. I bought this brass at a gun show. The primers had been removed and it had been cleaned. It was also of mixed manufacture and I suspect it was merely purchased at a firing range. Now we all know that Gaston Glock didn't ride a turnip truck into town, and I can't but wonder if this isn't part of the reason why he is so adament against reloading. New brass has sufficient resilience to take the pressure but brass weakened by numerous resizings won't hold together without full support. I futher suspect the angle of the ramp in this area has something to do with the phenominal feeding reliability of the Glock 19. At any rate I've bought a 1000 rounds of new remington primed brass and I'm storing all my old stuff until I get that Browning HP that I've been craving for the last several years. Comments Please. I'll let you know if I have trouble with the new stuff.
 
Are you shooting lead bullets?

Has there been lead shot in the barrel?


Is the recoil spring weak? The gun can come out of battery as you pull the trigger if the recoil spring is weak from use.


I have been reloading 9mm in my Glocks for over 12 years, well over 50K rounds and never a problem. I am surprised if there is not a simple explanation to your perplexing problem.



Ps- I just read your last post. I have always used range brass (junk brass I pick up). I have still never had a problem. I am surprised that you are, even with old brass. Some of my brass is really old junk, but the Glock 9mm is a strong gun and I have never had a problem.

[This message has been edited by Red Bull (edited June 12, 2000).]
 
To Red Bull: I have never shot lead in this gun. Mostly 115 JHP/FMJ and a few 125 JHP. Your comments seem to have shot down my theory. I'm going to Atlanta for a few days and will take it to the Glock people for a check up. My son's wife has a Glock 19 and the same thing happened to it, cracked the frame and ruined a high cap mag. She was using his ammo, not mine. Glock repaired it (for a price) but didn't offer any comment as to cause. I don't think it has been used much since so don't know if the problem is solved.
 
I am almost embarassed to admit how bad I am about the brass I use. I mean, I use the real junk stuff. I pick up brass out in the desert that is caked and filled with dirt clods, rinse it off and load it up. I don't even clean it more than a quick rinse ;) I have never had a problem with my trusty Glock 9mm's. I don't even measure OAL or guage in any way. I just am careful of course to stay within reasonable powder charges. Never a problem.
I always attributed it to my good, solid Glock which is designed to handle third world submachine gun ammo, so it is pretty tough. I hope get your problem worked out. It sounds like for whatever reason your gun is coming out of battery during discharge from a variety of reasons. Although, as you know, that is not the only possible problem.
 
To Red Bull: I appreciate your reply. I've gone over this gun literally with a magnifying glass. It appears in perfect condition. I loaded a primed empty case and managed to get it to fire out of battery. As I had anticipated, the firing pin struck the edge of the primer. Because of the shoulder on the barrel the slide must be all the way forward before the barrel will rise into battery enough to fire. I saved the brass from all of the blowbacks and the firing pin centered the primer in each case so we know it was fully into battery. There is a faint swelled ring around each case that might indicate that the slide released before the bullet cleared the barrel. I don't know how to check that.
I've shot on Army pistol teams and worn out two 1911s and never had this problem before. I thought I had the perfect gun in the Glock until this came along.
Keep your powder dry. I'll post any further developements.
 
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