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I am using this in combination with an Aero M5E upper, JP full mass BCG and JP supermatch barrel. This makes for a tried and tested system. I like the adjustability that that captured spring offers should I need to tune the system.
Please note that you need an M5 upper or an adapter for this rail to work. Comes with small torx mounting screws. It's the quality you would expect from Aero. I plan on building a second upper in 6.5 and will use an M5E upper with this rail.