Micro RONI generations and which Glock models fit

CAA has sold the Micro RONI in several generations since 2017, and each takes a specific list of pistols. Buying the wrong one is the most common mistake we see, because a chassis that fits a Glock 19 will not close around a Glock 17 and a chassis for a Glock 26 will not take either. This guide explains the generations and the fit lists as CAA publishes them, and how to confirm fit before ordering. It is drawn from the maker's published compatibility charts and owner reports; CAA revises its charts and product names, so treat the maker's current chart as the final word. We are an independent store, not affiliated with CAA or Glock. Chassis are accessories and ship to your door; see the legality guide before adding anything to the back of one.

How a Micro RONI holds a pistol

The chassis is a two-piece polymer shell. The pistol drops in, the halves close and latch, and the pistol's own trigger is reached through a trigger guard in the shell; a linkage presses the pistol's magazine release from an external button. The shell must match the pistol's frame length, slide length, trigger guard shape and magazine release position, which is why fit is model-specific rather than "any Glock".

Gen 3: the original Micro RONI

The first Micro RONI series was sold in versions for the Glock 17, 22 and 31 (full-size), the Glock 19, 23 and 32 (compact), the Glock 26 and 27 (subcompact) and a few non-Glock pistols such as the Sig P320 and Smith & Wesson M&P. It used a side-folding arm and a charging handle that engages the slide. Gen 3 kits are still in circulation and are often what a used listing means by "Micro RONI".

Gen 4 and Gen 4X

Gen 4 redesigned the shell with a thumb rest, an ambidextrous charging handle, improved latches and a slightly different fit list. Gen 4X added a longer forend and a magazine holder. CAA lists the Gen 4 family for the Glock 17 and 19 series with their Gen3 through Gen5 frames, for the Glock 22 and 23, and for the 26 and 27, plus versions for the Sig P320 and P226, the Smith & Wesson M&P and M&P 2.0, the Springfield XD, the Polymer80 PFC9 and PFS9, the Canik TP9 and others. Each version fits only the pistols on its own list.

MCK: the Micro Conversion Kit

The MCK is CAA's lower-priced chassis line, sold in Gen 2 and Gen 3 versions, with a similar drop-in design and its own fit lists. The MCK fits Glock 17, 19, 22, 23, 26, 27, 31, 32, 34, 35, 45, 47 and other models in the correct version, plus many non-Glock pistols; it is the line with the widest host list. MCK and Micro RONI parts do not interchange.

Stabilizer and no-stock versions

CAA has sold each chassis with a folding stabilizer, with a shoulder stock for registered SBR use, and as a bare chassis. The legal status of each configuration is covered in the legality guide. The shell and fit list are the same regardless of what is on the back.

Glock generations and fit

Glock frames changed between generations: Gen4 added a larger magazine release and a different frame texture, Gen5 removed the finger grooves and changed the slide and the magazine well flare. CAA's fit charts state which Glock generations each chassis version accepts; most current Micro RONI and MCK versions list Gen3 through Gen5 for the 17 and 19, while some older shells fit only Gen3 and Gen4. A Glock 19X or 45, which combines a full-size frame with a compact slide, generally needs a version listed for it by name. The Glock 43, 43X and 48 single-stacks need the slim-frame versions.

Pistols that do not fit

Any pistol not on the chart for that version. Common wrong assumptions: that a Glock 19 chassis fits a Glock 17 (it does not; the frame is longer), that a Glock 17 chassis fits a Glock 34 (the slide is longer; check the chart for the 34/35 version), that a 1911 or a revolver fits anything (no), and that a Glock with a threaded barrel and compensator fits (usually not without removing the compensator). Pistols with aftermarket extended slide releases, oversize magazine catches or bulky rail lights may not close in the shell.

How to check fit before ordering

Identify your pistol exactly: make, model, generation, and any frame or control modifications.
Find the chassis version that lists that pistol on CAA's current compatibility chart.
Match the version name and generation on our product listing to the chart.
If your pistol has an optic, confirm the chassis version has the optic cut-out; older shells do not clear a slide-mounted dot.

Optics and the chassis

Most current versions have a top rail that runs over the slide with a window for a slide-mounted dot, and a rail long enough for a red dot and magnifier or a low-power scope. The optics and accessories guide covers what mounts where.

Choosing a host if you do not own one yet

If you are buying a pistol to go in a chassis, the Glock 19 and 17 have the most versions available, the deepest magazine market and the most owner reports. The host pistol guide compares the options, and the chassis vs carbine guide asks whether a chassis is what you want at all. Search Micro RONI and MCK for chassis, or Glock 19 for a host.

General information, not legal advice. Current as of September 2026. Laws change; check the official source before you act.