I got my Marstar deluxe tactical mount three days ago and installed it that night. It was a bit tough to install (no instructions didn't help...). The piece that fit into the stripper guide area on my rifle was very tight, but did go it, so no complaints. I set it all up and checked it was right (evenly aligned etc), then undid all the bolts and put them back in with red locktite, tightened it until I was afraid the bolts would break (as hard as I could with a slot screwdriver and allen key the nuts were made for, and then using vise grips on the large round heads for an extra 1/10 turn) and let the whole thing sit for two days. I hit the range today and that thing is rock solid. I think I could jump on it and it wouldn't move. I've got no complaints about the mount. I'm hunting for another M14S and I'll put another one of those same mounts on it.