Have colt/ Walther 22lr Ar parts made in Germany quad rail brand new never installed in box and flip front sight you just Allen or can pin on barrel. Can fit on hk/ colt Walther made Ar pistols or rifles .this is made by Walther Germany for colt hk 22lr only will fit 416 22ar pistol or rifle and colt ar 22 all version the fsb m4 you will just have to tap the pins out and throw on a flip sight or the sight I have with the rail  .  Make offer or will trade for 556/233 55-62 grain ammo surprised this hasn’t been taken yet.. again can fit on all 22lr hk/colt -Walther AR Pistol or rifles will sell both for 90$ come get it I didn’t end up getting the colt Ar 22 so just sitting in. The box brand new