Firearm malfunctions inside the MCK—most commonly Failure to Eject (FTE) or stovepipe jams—are typically caused by three main factors: incomplete charging handle engagement, optic placement blocking brass ejection, or frame misalignment during chassis insertion. Correcting these mechanical factors ensures smooth cycling and reliable operation across MCK 1.0, 2.0, and 3.0 platforms.
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When a spent casing fails to clear the ejection port, the cycling action binds. Review the diagnostic breakdown below to pinpoint and correct the root cause of the malfunction:
| Malfunction Symptom | Root Cause | Immediate Action Required |
| Failure to Eject / Stovepipe | Charging handle teeth not fully engaged with slide serrations. | Re-seat handgun; ensure slide serrations match charging handle grooves completely. |
| Brass Bouncing Back into Port | Optic base mounted directly over the ejection port, deflecting spent casings. | Reposition optic forward or rearward on the top picatinny rail to clear the ejection path. |
| Slide Drag / Binding | Handgun pushed forward into chassis at an upward or downward angle. | Unlatch firearm; slide in perfectly level and straight to engage internal picatinny lock. |
The charging handle must fit snugly over your handgun's rear slide serrations.
Fully push your handgun rearward into the charging handle block.
Ensure all serrations on the charging handle fully engage and align with the corresponding factory serrations on your slide.
If the handle is seated too far forward or backward, energy transfer during recoil will be reduced, leading to short-stroking and stovepipe jams.
If you have an optic mounted on the top Picatinny rail and experience ejection failures, test the unit without the optic attached:
Optics mounted directly over the ejection port can catch or deflect spent brass back into the breach area.
Solution: Move your red dot sight or optic further forward toward the muzzle end or further rearward toward the shooter to keep the ejection window completely clear.
When installing your handgun into the MCK body:
Keep the firearm completely level and parallel to the chassis as you push it forward into place.
Do not push the handgun forward at an angle, as this can cause the internal picatinny lock to bind against the accessory rail, retarding slide speed during cycling.
🛠️ STILL EXPERIENCING ISSUES? If you have completed these checks and continue to experience cycling issues, please contact CAA Gear Up Customer Service at (561) 592-2287 or email support. Our technical team can walk you through advanced diagnostics over the phone or via email.