Not bad for the money but ... - SIG SAUER Pivoting Contour Folding Brace for MCX, MPX

First point, about the folding hinge...out of the box the hinge was very hard (tight) unlock from the open position. Even after mounting I was unable to unlock the brace until I dismounted from the rail. You have to push down on the top of the hinge to unlock from the open position. I couldn't see any reason for the tightness but with a small amount of trimming with a dremel in a few key areas and some more lube I was able to loosen it enough to operate by hand without using a piece of wood to push on the hinge. Second point, about the size of the hinge that protrudes down from the pivot point (bottom of hinge) kind of gets in the way when your hand is on the gun grip. (Im my case an Ruger PC Charger) but it can be raised up on the gun rail mount a bit. I ended up mounting the brace upside down so it would fold the other way (to right of the PC Charger) to put the protruding part of the hinge facing up but then you have to get used to activating the folding mechanism the opposite way. The arm brace part pivots anyway so it just flips over to work either way. Third point, the folding arm part...this part is a hard plastic and not aluminum but seems to be super strong and does not flex or bend. There is also a threaded end cap that will allow the arm brace end to be removed if desired. It is not a very comfortable or stable brace but it serves its function.