Late in 2017, I purchased my 6th Glock - a Glock 34. It is my first full-size Glock. I was eager to shoot it. I was quickly disappointed. I could not hit the broad side of the barn with it. Why??? I had the classic symptom of "Left Shooting Glock" - I was too ashamed to post about it. For sure, this is a problem of the shooter. But I know something is wrong, as none of my Glocks, nor any of my guns shoot this badly. What is this, a bent barrel or something??? At first I tried to fix the problem by drifting my rear sights to the right. While this did help a bit, it was ridiculous that my sights are drifted all the way to the right, and the pistol still shot somewhat left. This is what my target looked like last week, from the Bench, and with sights drifted to the right !!! : Without the sights drifted, my pistol could not even make it into the orange. I may be a bad shot, but I'm not this bad. Why did I not send this back to Glock? Because not only am I a bad shot, but I am also hard headed. After much frustration, I did more research and learned that an out of spec Locking Block may be the problem. While the OEM Locking Block for $25 was an option, I elected to spend an extra $10 more for the Lone Wolf Locking Block, which is machined to absolutely the correct specs. This way I minimize any risk of having an "out of spec" Locking Block again. This is the LWD Locking Block Part# 1447, $34.95 shipped: Machined, nice and shiny. It arrived in a few days. As described on their website: Glock OEM parts are MIM, some problems with MIM include: Is oversized by 20.6%, then sintered down in a mold to final size, this creates many deviations while molding MIM is bound by a glue. It is heated, the glue melts and then sticks together with the metal particles Lone Wolf's Benefits: 17-4 stainless steel billet certified materials, certs are held on file and can be traced back in the future Same as aerospace, very good for high stress situations Manufactured in a ISO 9001 facility Highly controlled tolerances, radiuses in critical areas Maximum amount of bearing surfaces since draft angles (required with MIM) are eliminated No surface treatment required 44C rockwell hardness (+/- 2) for durability Greater potential for increasing shot to shot accuracy ------------------------ So ... that doesn't look too bad for $10 more bucks over OEM. Why not. I might learn something.... ah, I'm also desperate. I installed it, re-centered my Sights and went straight to the range. Although I did not have time to do bench tests, I just shot right at the target. I will know if the problem is fixed or not. Here is what my Target looks like, off hand. 5-round intervals. Fast tempo. 4-rds to center mass, last one to head... 10 reps (50 rounds): That is good enough for guv'mint work, I think. I am very pleased with the LWD Locking Block. I'm not just pleased, I'm so happy, I have tears in my eyes... I love this G34. It does appear that indeed I had a defective OEM Locking Block in my G34. But I am happy now, I have the solution and want to share these results in GT. If you have a left shooting problem (or right, high, or low), I don't know if this will fix your problem (odds are, no), but for sure sometimes, it's not the shooter, it's the gun.... I have 5 problem-free Glocks other than this pistol, so it shouldn't be surprising sooner or later I will have one with an issue. However, I'm really glad is was easily and inexpensively resolved. .