Two CAA kits, one job: make your pistol a lot easier to shoot well.
The Micro RONI and the MCK both do the same basic trick. Drop your pistol in, lock it, and you've got a stock or brace, a longer sight picture and rails for a red dot and a light. No tools, no pistol disassembly. So why two kits? Because they cover different pistols and handle optics differently.
The Short Answer
- Get the Micro RONI if you run a CZ P07, P09 or P10, a Beretta APX, a Gen 6 Glock, or you want the most rail on top.
- Get the MCK if you run a Glock 20/21, 29/30, 34/35, 43X/48 or 44, or you want to keep aiming through a slide-mounted red dot (that's the MCK Gen 3).
- Run a Glock 17 or 19? Both fit. Read on.
Side by Side
| Micro RONI Gen 4X | MCK Gen 2 | MCK Gen 3 | |
|---|---|---|---|
| Glock 17, 19, 19X, 22, 23, 31, 32, 45 | ✓ | ✓ | ✓ |
| Glock 26, 27 | ✓ | ✓ | – |
| Glock Gen 6 | ✓ | – | – |
| Glock 43, 43X, 48 | – | ✓ | – |
| Glock 20, 21, 29, 30, 34, 35, 41, 44 | – | ✓ | – |
| CZ P07, P09, P10 | ✓ | ✓ (P10, P07/P09 versions) | – |
| Beretta APX | ✓ | – | – |
| Works with a slide-mounted red dot | – | – | ✓ |
| Suppressor and compensator ready | Plus muzzle accessories | ✓ (up to 1.38") | ✓ |
Based on the versions we carry. Exact fit varies by version, and every product page lists its own. When in doubt, the Micro RONI Builder only shows what fits your pistol.
Where the Micro RONI Wins
The Gen 4X has an extended top rail, so a red dot and a magnifier can live up there together, plus two side rails for a light or thumb rests. The charging handle stays inside the kit, the ejection port is bigger, and a spare mag rides up front. It is also the kit to get if you shoot a CZ, a Beretta APX or a brand-new Gen 6 Glock.
Where the MCK Wins
Range of Glocks, mostly. There is an MCK for the slim Glock 43X and 48, the big-bore 20/21 and 29/30, the long-slide 34/35 and even the .22 LR Glock 44. And if you've already zeroed an RMR on your slide, the MCK Gen 3 lets you keep using it, because it no longer rides on the slide serrations.
Glock 17 or 19 Owners: Pick One
Both kits fit, so it comes down to taste. Want the most rail space and the RONI accessory family (integral light, muzzle device, thumb rests)? Micro RONI. Want to aim through your slide dot? MCK Gen 3. Want the simplest, most budget-friendly box? MCK Gen 2.
Next Steps
Shop all Micro RONI kits or all MCK kits, or build a Micro RONI for your exact pistol.
Quick legal note: check your local rules before you pick a stock. In the US, a shoulder stock on a pistol may require NFA/SBR registration.