i have the micro on my 7 1/2 inch FA 454 for about a year now no problems so far with about 400 rounds fired . i dont think the burris will hold up under the heavy recoil of full loads but this is only a guess as the optima and doctor did not, i currently have a pride /fowler special ops sight( something like a fast fire) on my 6 inch 454 with no problems after 2 years and possibley 800 rounds . it was tested by p/f on the 500 s&w to be recoil proof