Just bought MK-12 Brand new.....Had optics mounted, Photon Xt NV. Took it home, set it on the Bipod, on my desk and began to inspect the firearm....Not good!! There is a break, not a crack or fracture, a break that runs the length of the gas block portion, approx. 3/8" above the three set screws. I have not yet fired the rifle, nor have I touched any screws or bolts. Upon further inspection, it looks like they could have beefed this thing up in a few places....Wall thickens of the steel that wraps around the barrel...too thin, gap at the bottom where the three set screws are, should have a shim set or a block at least...major stress point. My overall opinion of the Midwest Industries MI front sight tower.....Scrap Metal!! Don't waste your money or time. I have pictures and will be happy to share them.