Talley Fierce Rivalry Picatinny Rail, Tal Plm258779 Pic Bs Fierce Rival La 20moa Lower Parts Kit Supports guns perfectly for cleaning Supports guns perfectly for cleaning and scope mounting Compatible with Universal QD pistons barrel adapters (sold separately) These pic rails provide a mounting platform for all optics mounts that have been designed in accordance with the mil std 1913 pic rail specifications 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