Because Micro Conversion Kits (MCKs) are custom-engineered to match the precise frame contours, rail geometry, and slide dimensions of specific handguns, there is no universal MCK. Verifying your exact handgun specifications before purchase is essential for seamless operation, peak accuracy, and firearm safety.
Review the core fitment criteria, red flags, and generation capabilities before selecting your chassis:
| Verification Parameter | Factory Specification Requirement | Potential Fitment Red Flag | Chassis Action / Capability |
| Make, Model & Caliber | Exact factory stampings (e.g., Glock 19 9mm vs. Glock 20 10mm) | Assuming generic fit based on brand or frame size | Select exact model on drop-down menu or fitment chart. |
| Handgun Generation | Specific generation (e.g., Glock Gen 3/4 vs. Gen 5 vs. Gen 6) | Internal frame & slide stop geometry changes across generations | Match generation explicitly on compatibility charts. |
| Aftermarket Parts & Frames | Standard factory OEM frame, slide, and sights | Custom polymer frames, aggressive slide cuts, tall suppressor sights | OEM specs required; custom/3rd-party frames cause binding. |
| Threaded Barrels | Factory or extended barrel lengths | Barrel shroud obstruction on full-size extended barrels | Gen 1: Non-removable shroud. Gen 2 / 3 / EVO: Shroud removable for clearance. |
Never guess your firearm specs based on memory or general frame sizing:
Check Factory Stampings: Read the official markings engraved directly on your handgun’s metal slide or polymer frame (e.g., Smith & Wesson M&P 9 M2.0 4.0" vs. 4.25").
Confirm Generation & Caliber: Minor design updates across generations (such as ambidextrous slide stops or altered rail cuts) change internal fitment. Always verify generation (Gen 3, Gen 4, Gen 5, etc.) and caliber (9mm, .40 S&W, 10mm, .45 ACP).
Verify Barrel & Slide Length: Models sharing identical series names often feature varying barrel lengths that require distinct internal shroud configurations.
Before placing an order, cross-reference your pistol using CAA USA fitment resources:
Interactive Product Drop-Downs: Filter by your exact manufacturer, model, caliber, and generation on the official product page.
Fitment Charts: Review the master compatibility chart to confirm specific adapter plate or shroud requirements.
Aftermarket Frames & Custom Slides: MCKs are engineered strictly around factory OEM dimensions. Third-party frames, non-standard custom slide serrations, or tall suppressor-height sights can catch internal channels and prevent lockup.
Threaded Barrels & Shroud Removal:
MCK 1.0 (Gen 1): The front muzzle shroud is permanent and cannot be removed.
MCK 2.0, 3.0 & EVO: The front barrel shroud is fully removable to accommodate extended threaded barrels and muzzle devices.
💡 PRO TIP: Unsure if your custom handgun setup will fit? Take two clear photos of your unloaded firearm (one of each side, showing slide stampings and rail geometry) and email them to CAA USA Support for expert verification before ordering!
⚖️ Important Regulatory Disclaimer: Attempting to force an unlisted, heavily modified, or non-OEM handgun into an MCK chassis can cause permanent frame damage and void your product warranty. Always verify firearm compatibility prior to purchase and ensure firearms are completely unloaded with magazines removed during fitment checks.