Pistol shrimp? Help on shrimp id

[Wolla]

Ive had this bugger for years... finally got the courage to pull my rocks out to get him.... i believe hes the reason for my snails and small fish dying or missing but not positive since some snails have survived the whole 5 years ive had the tank ....

Any help would be appreciated
Thanks.

 

[Girthrockwel]

That's what it looks like to me.

 

[Rip Van Winkle]

Possibly this or something close.
http://portphillipmarinelife.net.au/species/_species/3841