[Bradd D]

 

[Bradd D]

There are some that feel the slide lock can contribute to shooting to the left. It's a crudely made part and may not be of uniform thickness. The mark left by the barrel should be centered on the slide lock.

 

[Bradd D]

3. The third point the barrel locks up with the locking block at the (front of) the lower barrel lug. The lower lug is just aft of the slide stop and comes in contact with the locking block.

So, if I push down on the barrel it shouldn't move.

 

[Bradd D]

Bradd,
If you push down it should move ever so slightly. However in firing that movement occurs after the shot is fired. When you push down in it you also cause the barrel to start to cam. Pushing down with your finger woul represent the vertical force component of barrel movement and not represent the motive forces during firing.

However the timing of firing the barrel is licked up. At firing the bullet exits and recoil moves barrel back. Simultsneosly pressure is reduce. As the barrel moves bak the slide moves back as the barrel cams downward . In the locked breech design the extractor hooks the spent cartridege pulling it from the chamber, pressure may assist but the extractor does the job. The spent cartridge hits the ejector and clears the port. The barrel will stop rearward travel by contacting the locking block end.
Spring sends slide for ward loading the round.The locking block guides the lower end of the barrel to assist in alignment. The upper contour of the slide and barrel upper lug fits to constrain lateral movement and barrel alignment.

The lurking issue with improvemt claims is that there were reports by people with Glock experience.
The problem was no objective testing and measurements before and after lend itself to speculation.
My take has always been bad parts could cause rare and unforseen problems.
I would test then if determine a problem consult with Glock.
If I decided to replace parts myself I would stick with OEM.
People need to have some humor and perform what if when solving unusual problems.

This isn't camming.

If I lock the front lug into the slide lock and push the rear of the barrel down onto the locking block, the barrel is no longer parallel.

 

[Bradd D]

My Glock 19 is very tight and has a good (new) RSA. So actual movement is not much more than a slight take up barely detectable.
So do not expect to detect much movement.
Yet the motion back and cammed.downward. So push the slide rearward and observe how far the to lug moves.
Your first picture is where there is very little to no detectable movement by pushing with your hand. That is because the barrel is licked up and the ammount of downward force by your hand is small.
The second photo shows how the licking breech tilts the barrel up as it follows the locking block and barrel contour.
The Browning licking breech design uses a barrel ling Glock and others use a lug.
Do you suspect your gun shoots left or are you interested just to gain some knowledge?

I'm just telling/showing you that the barrel does not sit on the locking block when everything is locked up.

 

[Bradd D]

The only time my Glocks shoot left is if I get fatigued and get sloppy.