I don't typically haggle any on new guns. The local dealers I frequent are already toward the lower end on most new guns and they don't have much room to haggle. I do haggle a bit on used guns where they have more leeway to bargain.
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.