Pistol Shrimp able to fire rapidly??

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Just curious if anyone knows wether a pistol shrimp can unload a full clip all at once or if hes a single shot? Im trying to figure out what the heck is still in my tank, went over the rock as best as I could when I put it in but low and behold I have 2 more crabs (thats 6 total!!) and as I was laying down for sleep last night I heard like 4 clicks fairly quickly, then 6. I got up and went to the tank with a flashlight but couldnt really see much. Im going to take a red marker light from a truck tonight and rig it up so I can look into the tank tonight with a red lense. Im just curious if its still a pistol or if its a mantis. Im getting kinda worried as I did see quite a few stripped stomatello snail shells when i pulled the last tank apart. I really want to get this pest thing sorted out before I throw all my coral back in.