VTDW is correct, however.......
If you have more than a passing interest in guns, sooner or later you'll want the correct tool for the job.
I have the Lyman "tapper". It is a hammer with three interchangeable heads (Brass, Steel and Nylon) along with a brass punch that's stored in the handle.
I've had my Lyman tapper for ten or fifteen yrs now, and it's been used countless times for drifting, or removing sights. You'll sure be glad you have one....I am.
I can't remember what I originally paid for mine, but at $13 bucks, it's cheap insurance you won't ding up a nice firearm.
hog
Here's a link to the "tapper" at Midway....
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=192310