The P kits contains your choice of a Ruger 10/22 stock takedown screw in Stainless Steel (P1 Kit), Titanium (P2) and Blued alloy steel (P3).  It also includes three vibration dampening rings, 1/8" hex wrench, bolt buffer, two stainless steel oversized trigger group pins, two stainless steel v-block barrel retaining screws, 5/32" hex wrench and three bonus 22LR dummy rounds.