Has anyone used both of these pistols? I'm trying to find which one has the fastest firing cycle.

I'm guessing blowback is easier for trigger pull as opposed to a long double action pull, but does the blowback cycle time limit how fast you can fire repeated shots?

Does the double ended magazine of the PX4 use the same rotary mags as the other Umarex guns, and can they be popped out of the stick for use in a speed loader?

What indication does either gun give to show you've run out of pellets?

Thanks for your help
Garry