rijndael

It's not all of my Glocks, I have nearly a dozen. It's just my late 2011 Gen3 gun and all 3 of my Gen4 guns. Recent mfr Glocks shooting left is not an uncommon issue. IIRC - The pistol-training.com test gun also exhibits the same issue. http://pistol-forum.com/showthread.php?1959-Are-Gen4-s-still-shooting-to-the-left&p=31821&viewfull=1#post31821

Out of curiosity, is this a Gen4 gun? All 3 of my Gen4 guns shot 3" left at 20Y with the rear sight centered in the dovetail. My late 2011 Gen3 gun has the same issue.

226 magazines that are made in Italy are by MecGar, and the US made magazines are by Checkmate. My Checkmate magazines have exhibited some follower binding, even when brand new. I fixed it by scrubbing the inside of the mag body with 0000 steel wool and Kroil. The Checkmate springs do seem quite weak, much weaker than MecGar mags.

I would also consider Apex Tactical. http://www.apextactical.com/about.php

First, I'd start by numbering all of your magazines so you can see if the problem is limited to a one or two mags. In the future, when you have a lock back problem, write down the mag number.To eliminate your grip as being the cause, shoot the gun with only your left hand. Load up all of your magazines with one round and keep cycling through, if it always locks back, it's your grip.

I'm surprised to hear about so many issues with an OAL of 1.15" in Glock magazines. I've shot over 17K rounds of Federal AE 124g ammo this year, it measures 1.151", I didn't have any issues.

If you buy factory springs, you should check out the Glock 22 mag springs. They're an 11 coil version, rather than 10, and should last longer.

ck1 - I think you mean extractors, not ejectors.

I would double check that you put the plunger & spring assy back in correctly. The metal plunger should touch the extractor, not the plastic spring loaded bearing.

I can't run the match but would like to shoot it.

I know the factory trigger springs (MP 9) are prone to breaking, but how are the heavier MA springs?

For the 19, there is also an 04 spring, which is lighter than the 03.

I would keep a slide lock spring handy. I've seen folks launch a slide downrange when it broke, and the lock fell out.

Google caches many web sites, Thoroughbred's included: http://74.125.93.132/search?q=cache:zl5jRgUu1ogJ:www.digitalsign.com/thoroughbred/slides.htm+www.thoroughbred-precision.com+apparel&cd=2&hl=en&ct=clnk&gl=us&client=firefox-a