Side rail for sight holder, 45 degree angle, made of aluminum, 4 grooves, for airsoft 45mm 20mm, picatinny pistol base adapter
https://www.vogueparade.com/shopping/EN/100005571/1/1005003392931323/side-rail-for-sight-holder-45-degree-angle-made-of-aluminum-4-grooves-for-airsoft-45mm-20mm-picatinny-pistol-base-adapter//