Talley Fierce Rivalry Picatinny Rail, Tal Plm258779 Pic Bs Fierce Rival La 20moa Lower Parts Kit A durable bronze housing and A durable bronze housing and stem offer straightforward thru hull flush mounting for minimum drag and optimum beam orientation for clear sonar returns Minimum Visible Distance: 3 Nautical Miles (Yachts and Powerboats) The fierce rival picatinny rail is designed and manufactured with precision to fit your firearm with the industrys tightest manufacturing tolerances talley manufacturings fierce rival picatinny rails are machined entirely from high grade 7000 series alloy and protected with a hard coat anodizing to 65 rockwell ensuring the craftsmanship of these picatinny rails last the lifetime of your firearm