Just buy these, from Birchwood Casey.
They are inexpensive, made from the right stuff and are just fine for pistols.
I use their centerfire, double swingers with .45s and they work perfectly.
They are often available at local sporting goods stores or off the web.
Generally priced around $40 - $45.
http://sport.birchwoodcasey.com/Targ...1-f8f663723030