This piece is designed to convert Airsoft so-called AUG A3 models into proper A3s. Currently all full size Airsoft A3/A4 variants by JG, ASG, APS and others feature a rail taken right off the A2 model with an added front piece however everyone seems to have forgotten to add the proper upper rail supports to complete the A3 look. So since I was fixing up my JG AUG I created a 3 part kit that solves this problem. These two pieces snap together around the center opening on the rail to fill in the the gap near the charging handle. To complete the look, check out the rear piece, available on my store. Please note this was designed specifically for the JG brand of the AUG A3, these pieces will likely fit other brands but have not been tested on other brands.