Both turn your pistol into a carbine in seconds. The question is which pistols, and how much rail you want.
The Micro RONI Gen 4 and Gen 4X from CAA work the same way: you seat your unloaded pistol in the chassis, close the lock and you have a shoulder-supported carbine. No tools and no pistol disassembly. The differences are in what they fit and what you can bolt on.
The Short Answer
- Buy the Gen 4X if you shoot a CZ P07, P09 or P10, a Gen 6 Glock 17, 19 or 45, or you want the extended top rail and side rails.
- The Gen 4 covers the Glock 17 / 19 family, the Glock 26 / 27 and the Beretta APX, and it costs a little less.
Side by Side
| Micro RONI Gen 4X | Micro RONI Gen 4 | |
|---|---|---|
| Glock 17, 19, 19X, 22, 23, 31, 32, 45 (Gen 3–5) | ✓ | ✓ |
| Glock 44 | ✓ | – |
| Glock 26, 27 | ✓ | ✓ |
| Glock 17, 19, 45 (Gen 6) | ✓ | – |
| CZ P07, P09, P10 C, P10 F | ✓ | – |
| Beretta APX | ✓ | ✓ |
| Extended top rail plus side rails | ✓ | – |
| Folding stock, stabilizing brace or telescopic stock | ✓ | ✓ |
| Kit only, Basic, Advanced and PRO levels | ✓ | ✓ |
Gen 5 slides on the Glock 22, 23, 24, 27 and 35 are not supported by either generation. Each product page lists its exact fit.
What Stays the Same
Drop-and-lock install, no disassembly, Picatinny rails for optics and lights, and the same four kit levels. The Basic level adds thumb rests, flip-up sights and a one-point sling, Advanced adds a flashlight and a carry bag, and PRO adds a red dot sight. Read Micro RONI kit levels explained for the full breakdown.
Which Should You Buy?
Start with your pistol. If it is only on the Gen 4X list, the choice is made. If both fit, the Gen 4X gives you more rail space and covers more pistols if you change guns later, while the Gen 4 saves a little money.
Shop the Micro RONI Gen 4X or the Micro RONI Gen 4, see every kit on the Micro RONI page, or put your setup together in the Micro RONI Builder.
Check your local regulations before choosing a stock. In the US, a shoulder stock on a pistol may require NFA/SBR registration.