Handi: Last year I wanted my stainless Encore dulled down for hunting in Tennessee, where there was a lot of Turkey around the deer stands. I went to an archery store and bought a kit for camoflage bows. It is a paint that comes in four colors and you just spray it on after degreasing the gun. This paint is soft and scratches off easy, but can be touched up fast and easy. The nice thing about this system is that when you are finished, or no longer want it painted, plain mineral sprits wipes it right off. I've since done my Handi 30-06, metal and wood.
Personally I love Parkerizing, I have four guns done that way. A 98Mauser in .35 Whelen, a .338 TCR, a Ruger .350 Rem Mag, and a Smith & Wesson 12ga pump. It is nice they don't rust in the rain, but it does wear off. My hunting partner had a polymer coating sprayed on two of his guns, it looks real nice and is very durable. One was done in OD, the other one is brown. It cost about the same as Parkerizing.