Dr. Black 5.1 aluminium long dust cover version. 

CNC out of aluminium with one of the best finishes I've seen in Airsoft so far. These really do look amazing!  

Super long design to give your 5.1 build that "4.3" look

Super lightweight at only 69g!

This is a 5.1 lengh frame and will sit to the end of the 5.1 slides (like a typical 4.3 design). Please check pictures.

*PS: Please note: installing parts / assemble /fitting airsoft frames will need intermediate knowledge. Please refer to your Airsoft gunsmith for proper installation / fitting. Fitting may be needed as the condition of each airsoft gun might be different. Regular maintenance is needed for all airsoft guns in order to keep it in good working condition and reduce wear out issues on parts. 

The actual performance is based on the overall setting on your airsoft gun.