where is the survivalists rifle and the 6 caves his termanols r in thank u

The rifle is in a duffel bag in the Southwest part of the map just before Three Marys. The terminals are in the caves around Zion.
http://www.falloutwiki.com/

To add to Sergeant RL-3's comment, the caves that the Survivalist has stayed in are marked with white hand prints at the entrances.

thank you pal

Just wanted to add, there's a very annoying glitch/ bug where a YaoGuai will "take" the rifle. Making it nearly impossible to get.(I think it's the weapon being discussed)