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yes that is a 555 timer it will work if your doing the 555 timer rapid fire mod.
I jut read post number 4 again. the timer needs other input components to make it provide the signal we need for the mod. different componenets will make the timer respond differently, whichs is why alot of people have slightly different timing values. http://www.datasheetcatalog.org/datasheet/texasinstruments/tlc555.pdfany 555 timer should work, but the tlc555 timer is made to operate at low power.