Good day! I couldn't find a decent MONOPOD for my 50 BMG anywhere for under $ 180.00 so I decided to make a few! 2.5" sturdy quick release bases..fits Picatinny or Weaver rails, 3.5" of fine elevation control if used as an excellent front end hand grip for any AR or rifle with M-Lok rails or Picatinny. Made from one piece 1"1/2 ballistic nylon, machined for stainless 3.5" bolt with lock nut. Price is $ 105.00 shipped anywhere in North America. Colors available...Dessert Tan, Hunt club Green or unpainted standard material Grey. Thanks.... elevation is about 28 degrees when fully extended! Also can supply M-Lok type rails up to 5" and t locks if needed at additional small cost!