I just stumbled across this Czech webpage, very clean mounting system used for IPSC...that dont run into the typical shell casing issues either. Kind of neat and worth checking out.
http://www.zbrane.cz/Stranova-montaz-na-SA-58-detail-zbozi-126.html
http://www.zbrane.cz/Stranova-montaz-na-SA-58-detail-zbozi-126.html


















































