Tier One UIT Rail Adapter.
EVO FTR BIPOD (BLACK) TIER ONE UIT rail - Proptics
Tier-One UIT Adapter Rail for Tactical & Evolution Bipod - Optics
Tactical Bipod Adapters
Reduction (adapter) UIT to WEAVER picatinny rail
bipod Rimfire Central Firearm Forum
Bipod Sling Swivel Adapter #6A for 5/16 Competition
UIT / ANSCHUTZ PICATINNY ADAPTOR RAIL – STÄGER SPORT NZL
ADAPTERS - Harris Bipods
Tier-One Picatinny Adapter for Stock - Tactical & Evolution Bipod
Adapters - Tactical Bipod
Tier-One Sling Stud Adapter for Tactical Bipod - Optics-Trade
Spartan Picatinny Adapter - Tier One®