The Area 419 RailChanger is a great option for competitors looking to gain and edge. The railchanger comes with Area 419's ARCALOCK clamp allowing it to be mounting to either their ARCALOCK rails or most standard Arca/RRS 1.5" Dovetail rails. The RailChanger is designed to be utilized with RailChanger equiped support bags. The bags can be mounted to the arm allowing hands free use of the support bag. RailChanger bags hang from the RailChanger allowing them to easily drape over barricades, cattle gates, or anything else match directors can come up with. RailChanger Arm with ARCALOCK Clamp Made form 6061-T6 Aluminum Type 3 hard coat anodized For use with R Mfg: Area 419