ZEV Z43 & Z48 Duty Slides: RMSc Cut for Glock 43X and 48

ZEV added two slimline Duty slides with an RMSc optic cut: the Z43 Duty for the Glock 43 and 43X, and the Z48 Duty for the Glock 48. Both are machined from 17-4 stainless steel, wear a black nitride finish, and list at $299 on ZEV's store, under SKU ZA05-10-1706-10 for the Z43 and ZA05-10-1707-10 for the Z48.

This is a straight port of an existing ZEV product line rather than a new design. The Duty slide is ZEV's plainest, least ornamented slide, already offered for the Glock 17 and Glock 19 in RMR, ACRO, DeltaPoint Pro, and 509T cuts at the same $299 price. The slimline versions bring that same slide to the carry-size Glocks that ZEV previously skipped.

One naming note worth clearing up: some dealer listings title these as fitting a “Glock 43 Gen 5” or “Glock 48 Gen 5,” which tracks the 5G in ZEV's own part numbers. Glock does not sell a Gen 5 43, 43X, or 48. The slimline pistols are their own family. ZEV's product pages state the fitment plainly: the Z43 is cut for the Glock 43/43X and the Z48 is cut for the Glock 48.

Buy one of these if you own a non-MOS Glock 43, 43X, or 48 and want a red dot. That is the entire case. The factory Glock 43X MOS and 48 MOS ship with a factory optic cut, standard Slimline MOS slides on the Shield RMSc footprint and newer MOS-K slides taking Holosun K and RMSc, so an owner of either one gains nothing here. The plain 43, 43X, and 48 have solid slides, and until now the options were sending a factory slide to a gunsmith for milling or buying a complete aftermarket slide.

The argument for buying the slide instead of milling is reversibility. Custom milling permanently cuts the slide you already own, and a botched or later-regretted cut has no undo. Buying a Z48 at $299 leaves the factory slide untouched in a drawer, so the pistol reverts to stock configuration any time you want it back, and you keep a complete spare slide with working internals.

Both slides take RMSc-pattern optics. The Z43 and Z48 are cut for the Shield RMSc footprint, the widely supported micro red dot pattern on slim carry pistols, and ZEV publishes its own named compatibility list for both slides.

Check the footprint before ordering glass. The Holosun 507K and 407K, which are extremely common on slimline Glocks, use the Holosun K footprint rather than RMSc, and they do not appear on ZEV's list. For an enclosed Holosun that mounts straight to an RMSc cut, the EPS Core is the direct-mount choice, with the full-size EPS window in a 1.4 oz body; the EPS Carry is built on the Holosun K footprint and ships with an RMSc-to-K adapter plate. If you are shopping the optic and the slide together, our enclosed-emitter pistol red dot guide ranks the sealed options that survive pocket lint and carry debris.

The box contains the slide and nothing else. ZEV lists “Duty slide” as the sole included component, so the real cost of this project is higher than the sticker. You supply the striker assembly, striker channel liner, spring cups, extractor and extractor depressor plunger assembly, and front and rear sights. The barrel and recoil spring assembly transfer over from your factory slide.

Two ways to handle that. Pull the internals out of your factory slide and move them across, which costs nothing but leaves the factory slide inert until you buy a second set of parts. Or buy a slide completion kit and keep the original slide fully functional, which is the better option if you want to swap between an optic-ready setup and stock irons. Sights are a separate purchase either way, and you want suppressor-height or optic-height irons if you plan to co-witness under the dot.

A used factory MOS slide is the cheaper path if you can find one, and it comes complete. The ZEV wins on two things: it is available right now at a known price, and it keeps your factory slide intact and unmodified. Factory slimline MOS slide assemblies sell inconsistently on the secondary market, and complete ones command a premium precisely because they include the internals the ZEV does not.

The honest read is that this is a convenience and quality purchase rather than a value one. If the goal is simply a slimline Glock with a red dot at the lowest total cost, buying a 43X MOS or 48 MOS outright is the cleaner answer. If you already own a non-MOS slimline Glock you like, the Z43 and Z48 are the least invasive way to add a dot without cutting the slide you have. Our Glock slide guide ranks the broader aftermarket field, and the Glock 48 upgrade guide covers where a slide sits against triggers, magazines, and barrels in the upgrade order. You can also spec the whole pistol in the builder to see how the parts stack up before spending.