Don't have the 4003tsw, but do have its heavier brother, the 4006tsw with stainless steel frame. The TSW models have some different parts which help dampen the felt recoil of the 40cal bullet, which seems to do just that. I am able to shoot accurately to the point that it compares favorably to my M&P full size 9. Here is a link to an article about the TSW models giving an explanation of the differences you find in a TSW model. Not sure if this is what you were looking for, but hope this helps. zorro49
http://findarticles.com/p/articles/m...24/ai_61861509