Gen4 Glocks 9mm problem. UPDATE!

[ap3572001]

Does Gen 4 trigger pull feel the same as Gen 2 and 3?
Have you possibly done something to your Gen 2 and 3 in the past that makes them feel more "predictable"?
Same sights?

What happens if you shoot off that first flyer, then shoot a few into the group, then lower your hand and wait for a minute, then sight in, and shoot another round? I guess I am trying to figure out if it is the first round of the day, or first round after you take a break.

If I shoot the FIRST round that I manually chambered, I will end up with good group exactly where I want it to be.

[MosinVirus]

So you only get the flyer when you operate the slide?
And when the gun cycles the slide, the rounds go where the sights point?

If that is the case, I would look into whether the slide returns to battery properly when you chamber the round manually.

Don't Gen 4s come with dual recoil spring setup? I know some Gen 3s did also, but hey, I would look at that.

And my Gen 4s (19 and 30) are both being good little pistols. Never had anything g you experienced.

[ap3572001]

So you only get the flyer when you operate the slide?
And when the gun cycles the slide, the rounds go where the sights point?

If that is the case, I would look into whether the slide returns to battery properly when you chamber the round manually.

Don't Gen 4s come with dual recoil spring setup? I know some Gen 3s did also, but hey, I would look at that.

And my Gen 4s (19 and 30) are both being good little pistols. Never had anything g you experienced.

EXACTLY. ONLY the first round is a flyer. Did not have that issue with my GEN2 and GEN3 Glocks.

[mjmagee67]

My Gen4 G17 duty pistol is pretty darn accurate first through last shot.

[MosinVirus]

EXACTLY. ONLY the first round is a flyer. Did not have that issue with my GEN2 and GEN3 Glocks.

Without seeing the gun in person and trying it out it is hard to tell what the issue may be. BUT it seems that since the issue occurs only when you close the slide by hand, It has to be the way you close the slide. And maybe it has something to do with the Gen 4 differences (dual recoil spring setup, etc).

Could also be the long (initial) trigger pull, which does feel different from Gen3 that throws you off, but since you are an experienced shooter, I doubt that is the issue.

So, given what I now understand to happen, I am thinking that when you close the slide by hand, something happens where the barrel is just slightly out of alignment. Then when the pistol takes care of cycling the action, everything works fine.

[kian]

Three things I would try to troubleshoot:

1) Try with a magazine that is at less than full capacity.

This should let you know if the pressure from the rounds in a full mag is interfering with the slide cycling and going into full Battery

2) chamber a round by hand without the Magazine.

Should let you know if the problem is something else in the mag.

3) insert a fully loaded magazine with one in the chamber

You should get two flyers in a row. Otherwise the issue is to do with you hand cycling I think.

All this is to figure out if the problem is you or the gun. I would assume it's the gun since you shoot excellently and have a bunch of glock experience.

Sorry o could be more helpful. My gen4s are consistent shot to shot.

[MosinVirus]

OP, how do you send the slide home when you chamber the first round?

[ap3572001]

OP, how do you send the slide home when you chamber the first round?

Let it slam forward

[MosinVirus]

Let it slam forward

Then I am out of ideas.

[ap3572001]

Then I am out of ideas.

I am aware that round chambered manually may print a little off from the group. In case of 9mm Gen 4 Glocks , it's a bit too far off for my taste.

[MosinVirus]

Well, the first round is a long trigger pull, subsequent rounds are fired with short trigger pull, unless you let the trigger out completely. So could this be the difference?

[k1dude]

How many rounds do you have down the pipe? I've seen some guns (including Glocks) do some funny things until they're well broken in. I would put at least 200 to 300 rounds downrange before worrying too much.

[Milsurp Collector]

Possibly your Gen 3 pistols are broken in and the Gen 4 pistols your bought were new and weren't shot enough to break in. See https://www.americanrifleman.org/art...st-shot-flyer/

Basically, it works like this. In order to load an automatic pistol, the shooter must manually retract and release the slide, which strips a round from the top of the magazine, feeds it into the firing chamber and closes the slide. After the first shot is fed and fired in this way, the slide snaps rearward and cycles the pistol's action. When the first round was fed (manually), the slide and barrel settled into a particular position in relation to the receiver. When subsequent rounds are fed, the violence of firing causes the slide to move at a different speed and the recoiling parts of the gun settle into a slightly different relationship. This means that the first shot goes to a different spot on the target than the remaining shots.

I have also noticed that the phenomenon slowly disappears as the parts of the gun wear in with rounds fired. In one shoot, it took about 4,000 rounds to get a 7 o'clock flyer to slowly migrate into the group.

[ap3572001]

Update! The problem happens only when I load from fully loaded 15 or 17 Rd. magazine. I guess mystery solved.

[Soginator]

Update! The problem happens only when I load from fully loaded 15 or 17 Rd. magazine. I guess mystery solved.

That still shouldn't happen imo.