I am curious about the Harrts and Springco recoil reducers as I might want to test drive one in a full size 1911. Do they actually tame recoil or is it smoke and mirrors? The Sprinco utilizes a dual spring setup which does seem to work in my Glock 29 and 30. The Harrts uses a mercury/ball bearing setup whose MO ecsapes me but I am gullible enough to believe the PR. So back to the origianl question, do they work? Do they adversely affect reliability?