T...
Review confirmed by purchase 
A plus for stiffness, it fits well into the guides, you don't have to press hard to close the gearbox. The first minor downside: there was some excess material on the side of one rail. After closing the gearbox, it was so tight that it stayed in the rear position. Maybe it's because I use DSG, because the second minus is: I didn't even shoot 100 BBs and the rail was already worn down at the contact point with the gear, and there were small bits of crushed blue plastic on the gear.
