My lgs has had new and used versions of these revolvers. The ones that I examined had very heavy double action pulls. Hammer or main springs have a higher weight to set off the rim fire round. This weight coupled with a stout rebound spring causes a really heavy da pull. These statements have applied to rimfire J frames for decades. The Ruger LCR .22 has a strong hammer spring also. Though I like snub revolvers including these, I'm not certain how useful the rimfire versions are for self defense. Bulk is the same as a .38 Spl J frame.