Spear Gun Mount The Spear Gun Mount allows Sport HD to be mounted on spear gun with cylindrical shaft diameter between (1.38 to 1.5) inches / (3.5 to 3.8) cm and adjustable to 4 different configurations. Weight 5 oz /141.8g. BUY INTOVA PRODUCTS FROM AUTHORIZED DEALERS ONLY: To ensure proper warranty coverage, make sure Intova products are purchased from legitimate retailers only. Be sure that the dealer has a mailing address and provides a receipt that verifies: Dealer Name and Address. Customer Name and Address. Date of Purchase. Complete Description and Cost of items purchased. Receipt must be presented for warranty service.