I ordered a tube of Rocksett from silencer shop a few weeks ago, and went to mount my flash hider this afternoon. The tube felt fine, but when I opened it up, it was all gummed up like it had already dried. It was malleable, but definitely not liquid (it felt kinda like that non permanent glue they use in the mail). I'm a little disappointed, as this is 2/2 transactions with silencer shop that have not gone great for me (I did not bring the first one to the forum, as it was eventually resolved). I managed to jam it into the threads and get it threaded on, but I'm not positive it worked. I do have to say, I'm a bit disappointed in silencer shop. Who knows how long they've had those tubes of Rocksett sitting around drying up.
ETA: Silencer Shop fixed the issue and then some!