Hi I have a as new in box. GG&G one pice. clamp on gas block folding front sight assy for .750 barrel ar15's. (HBAR, M4, Car, etc.). This acts as both the gas block and front sight. Sight fold out off way when not in use. Has ambi sling attachment points. and bayo lug. Great for optic mounted uppers or adding a FF tube. Shipped $125. Money order, personal check or Gunpal (3.5%) new i payed $189 +shipping.