Glock Grouping Problem

If swap complete slides with another glock and then the frame in sure someone on here would be willing to meet you at the range
 
tiriaq said:
Well, the pistol was tested with a different barrel, and also using a laser instead of the sight.
Same pattern; first shot out of the group, low to the right.
Click to expand...

If the shot is being displaced by increased pressure by the stack of rounds in a full mag, then repeating the test with only 5 rounds in the mag should solve the problem. If it does, then you know where the problem is and how to solve it.

I would try clipping a coil from the mag, if the 5 round trick works.

Please report back. This is interesting.
 
tiriaq said:
Different barrels, different magazines, single loading, full mags, less than full magazines have all been tried. First noticed starting with 5 rds in the magazines, but it does the same thing with 10.
Consistent performance - the first shot goes right and down. First shot groups are respectable - just away from all subsequent shots.
Click to expand...

Ganderite said:
If the shot is being displaced by increased pressure by the stack of rounds in a full mag, then repeating the test with only 5 rounds in the mag should solve the problem. If it does, then you know where the problem is and how to solve it.

I would try clipping a coil from the mag, if the 5 round trick works.

Please report back. This is interesting.
Click to expand...

Looks like hes already tried that. This is a very perplexing problem indeed.
 
Ganderite said:
If the shot is being displaced by increased pressure by the stack of rounds in a full mag, then repeating the test with only 5 rounds in the mag should solve the problem. If it does, then you know where the problem is and how to solve it.

I would try clipping a coil from the mag, if the 5 round trick works.

Please report back. This is interesting.
Click to expand...

The problem first became apparent with 5 round magazines. We have a match at 35 meters with 5 rounds in each of prone, sitting, kneeling and standing. Four 5 round magazines. The first shot strays were noticed. Shots monitored with a spotting scope. Subsequent testing has been with various magazine capacities. If a series of rounds are manually cycled, the group will form low and right. Autoloaded rounds are centered.
We're stumped. The phenomenon is predictable and repeatable. It doesn't occur when the owner uses other pistols, with either irons or optics.
Holding off for the first shot would be second rate solution.
 
Maybe an ejector/extractor issue? Manual vs Auto loading would put slightly different stress on the springs due to the force and the direction of the slide and barrel in relation to the chambering round. If the extractor is slightly bent or the ejector is sticky then it could potentially be ever so slightly out of battery. When the round autoloads it powers through the issue. Not sure how you’d test that other then replacing your springs and measuring the small parts with a handgun not showing these symptoms.
 
Last edited:
I don't shoot glocks , ya strange, I was going to suggest the sight, but sound like the laser test was done? and not that. Funny my Norinco's don't do that
I have seen that with a couple of 22 match guns I shot years ago Domino 602 and walther OSP , first shoot would always be off one l-r the other I can't remember.
in this case off was 1/4 in, but same idea , only way I solved the problem with the OSp was sell it and the other one I just got use to it as I like the silly thing, and just informal shooting, so 1/4 " is O.K.
My option is it will have something to do with lock up as you have changed the barrel, so tight chamber is not the trouble, changed the slide Yet??????????????
changed the shooter, but in this case don't sound to be the problem.
Different gun could fix it, but that will not solve it
 
Bullet setback issue? Hand fed rounds go in gently, and automoded ones don’t? Have you inspected the cartridges before and after clambering? Say, inspect and record the length of the rounds and then inspect them before firing? I don’t know, what you describe happening is very weird.

Process for my idea:
Record length of all arounds in the magazine.
Load magazine
Chamber first round
Remove and inspect for differences
Fire next round
Inspect auto-loaded round for setback or other differences
Repeat
 
You must log in or register to reply here.
Back
Top Bottom