Magpul Industries, MBUS 3 Back-Up Front Sight, , Flip Up, Black Springfield It has a top-load battery

It has a top-load battery you can only find in $200+ optics and features like a 7075-T6 aluminum body

utilizes Holosun's K footprint

a Trijicon SRO® mounting kit (AC32085) is required

Aircraft Grade 7075 Aluminum

Converts the Springfield Hellcat/RDP/PRO with RMSC Slide Cut to Holosun 407K/507K

Magpul Industries, MBUS 3 Back-Up Front Sight, , Flip Up, Black Springfield It has a top-load batteryThe next evolution in Magpul's MBUS (Magpul Back Up Sight) line, the MBUS 3 incorporates the best features, strengths and value of their original MBUS and MBUS Pro Sights in a feature packed back up sight system. Significantly reduced in size from the MBUS, it sits at just 0. 44" high when folded and 1. 15" at its widest point. Its aesthetics are derived from the MBUS Pro, but the MBUS 3 Front Sight is constructed of their impact resistant polymer,