I have one, haven't had a chance to use it yet but it seems well made. It's steel and pretty heavy. I also had to modify my handguard so it would fit the way I wanted it. It's 1.4" outside diameter and the slim handguard is about 1.2" inside diameter so I had to open up the inside for it to fit without touching. It was supposed to come with a steel pin for welding it to a barrel but mine didn't but I'm not using it anyway so I didn't care. It comes with 2 front ends, 1 is a plain cap and 2 is a prong type, Spikes advertises that there will be more front ends for it in the future. Also it has a removable cone for cleaning. I can't wait to try it out but my build isn't done yet, this is going to be my interpretation of an E-11 blaster. Mine is the .30 cal unit for 300BLK and should tame what little recoil there is for that. Sorry it's not a better review but haven't had time to finish the build and go shooting. I like it so far.