Right On with the report. I have both the 4006 and the 5906 and their, to me is not a significant difference in recoil except the 4006 seems sharper/quicker in recoil to me. I shoot pretty much left handed as a stroke during brain surgery limits my right handed use. Also my left eye now doesn't work correctly so I have to use my right eye to aim using my left arm/hand. I am very accurate and I am about 6' and 215 lbs.