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If you're referring to the unique grenade launcher, it's located in a gun case on the left side of the map among other things. I'm unsure of it's specific location but just search the whole left side, you'll find it eventually.
--- Call someone a Woman = Trolling. Never change Mods. ~GT = Faint DVS~
@XShadowStrike99 As long as you have the highest fame for the NCR it doesn't really do anything, you can nuke them, go kill the ghoulified NCR and they will just smile at you the whole time. The stupid one to me was nuking the Legion since if you're fame even drops 1 rank with them they turn on you.