[SuperHog]

I won't dispute your reasons, but I have my own.

I raced off-road RC cars in the 80s with brushed motors till the industry switched over to brushless motors. These are open end bells and some with cut out around the motor cans. We run these off-road cars in dirt, dust and even in light rain. After a race we can tap the side of the can and see dirt fall out. Never had one fail to those elements. Motors that trap the heat in will fad power as they heated up and eventually died.

The the motor technology in the AEG and PTW are not even advance as the ones in RC cars. We are now racing brushless for many years, and yet the airsoft guns are still brushed.

Run the grip off a PTW and feel the head from the armature after 50 some shots, it is very hot to touch. You need to get rid of that heat not trap and seal it in the grip.