I have read everything I can find on adjustable gas blocks here on the forum and a few others as well. I only ask because manufacturers are constantly redesigning and improving their designs. What may have been the best product available a year ago may not be now. I like the SLR Sentry but I can't find many reviews about it let alone get my hands on one personally. I understand people get tired of seeing the same generic questions but its going to happen. After all, none of us were born with a bore snake for an umbilical cord.