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Originally posted by DanH:
I've heard a lot of bad things in regard to quality control and wondered if things have cleared up.
The aftermarket for Glocks has possibly surpassed the aftermarket for 1911s. Some of the QC problems are explained by owners mixing & matching parts from too many different manufacturers. Zev designs their guns & parts to fit tightly and consequently sometimes don't play well w/ other brands. This is the same issue owners have w/ 1911s and ARs. We had a thread recently about 'This Glock isn't drop-safe' that demonstrates that.
If you buy a complete Zev gun, they recommend ~500 rounds break-in. Shadow Systems does too. This is same thing high end 1911 manufacturers recommend. The break-in period is often a source of QC complaints by users who didn't read the manual. I have gripes about 'break-in periods' and manufacturing tolerances; however, that's considered part of the 'price of admission' for many high-end guns.
The most common complaint I've seen regarding Zev Glocks is 'Failure to feed/extract'. This is often resolved by using an OEM Glock extractor instead of Zev's. In two of my three Zev slides, I run Glock extractors.
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Zev slides do have one of the deepest RMR cuts on the market.
If you're committed to the RMR footprint and don't care about switching to other footprints, Zev arguably has the best RMR cut on the market. They do what have come to be known as
Zev posts. The posts extend up from the slide through the mounting holes in your optic. This takes stress off the screws, so the screws won't shear.
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I've also been looking at used XR920s and the temptation of getting one and throwning a Radian Ramjet is also high.
I owned an MR920 Elite and shot other Shadow Systems models. To me, they didn't do anything better than my stock Glocks, so I didn't see them as an upgrade.
I own 2.5 Zevs: an OZ9c, a complete G19.3 build (everything besides the frame is Zev), and a compact slide that I can throw on any Gen5 G19/45/47/49 lower. I only consider a handful of aftermarket brands to improve on OEM Glock, and Zev is one of them.
As with 1911s, tighter fit & tighter-shooting groups can come at a cost of reduced reliability. You have to shoot several hundred rounds and possibly spend some time tuning (changing spring weights & small parts) before you decide the gun is where you want it and if you feel confident about relying your life on it.
