Ok it is the BJR182Z I’ve tried diablo blades, Milwaukee blades, dewalt blades, and finally today used the original makita blades that came with the saw. They all lock in securely I can’t pull the blades out by hand while locked and I start using it, the blades pop out. I’m going to try and clean it but, it doesn’t look dirty no paint inside the sleeve. And if it doesn’t hold the blades still I’m buying a Milwaukee fuel 18v.