Models TierOne bipod adapter 0 5 0 Picatinny rail for Sako TRG handguard 5 116 0 AR Carbon Handguard 17 178 2 Picatinny rail for Sako TRG42 10 287 1 Tikka T3X lightweight Stock 18 125 0 Tikka T3X Tactical Carbon Handguard 23 204 0