I'm fairly certain that Rocksett doesn't count as permanently attached. Also, in the case of the MK18, a 10.3" barrel plus a 4.2" length added silencer only makes up 14.5", not 16", so still an SBR. Now, on a 12.5" you might be on to something, but I still wouldn't pin/weld a silencer. Rocksett is just to prevent a thread-on can from loosening. The advantage the Ranger 3 offers over other thread-on silencers is the wrench flats allowing you to use something like Rocksett to prevent it's unthreading during fire, but still allowing the ability to remove it for maintenance, etc.
I have a shop in my garage where I can (and have) built uppers from scratch. I'd leave the can on 99% of the time ,but if I needed to swap it out, it would only take me a few minutes max to unscrew the can and screw on the flashhider.
Last edited by ASH556; 04-19-12 at 13:49.
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