I have been using it for a few years. It can be removed with a good breaker bar. Its strength really relies on its ability to not be affected by heat, not necessarily shear strength. If using it on a AR/M4 type platform I would recommend using a barrel clamp to take it off, not a upper receiver clamp. The reason for this, is that it is possible to torque the upper receiver due to the "break" torque required. It has a tensile strength of 250 Pounds Per Sq Inch and a shear of 450.
Before trying to remove the "rocksett'ed" device I would recommend soaking the muzzle with the flash hider in water for a 24 hour period. I have never had to do this, but, in discussions I have read of others on other boards, this was required for their success.
I use it on any weapon that has a flash-hider or adapter for a can. Its pretty amazing stuff. If you are considering buying it, it is sometimes difficult to locate. The best place I found is MSC tools direct. They seem to have the fastest shipping I have ever seen. My orders normally take about 24 hours. I would recommend them. One bottle should last you a lifetime. It has the consistency of water.
http://www1.mscdirect.com/cgi/NNSRIT...-SearchResults
http://www.flexbar.com/shop/pc/ROCKS...OZ-82p4020.htm
http://www.gem-tech.com/store/pc/Roc...ive-25p124.htm