A spare dust cover with attached picatinny rail for your Galil ACE Gen I in 7.62 x 39 and Galil ACE Gen II 7.62 x 39 & 5.45×39 .
Please follow the section on disassembling the cover (page 46) on the Galil ACE 7.62 x 39 manual for disassembly and assembling the cover (page 54) for assembly. You can access the manual here.