Accu-Tac PC-4, Bipod, Black PCB-0400 The Accu-Tac PC-4 bipod was designed" engineered" and manufactured in the USA. This PC bipod is perfect for tactical" target" competition" and airgun shooting. This is only a suggested use" this model is not exclusive for these applications. The PC-4 is 100% billet" made from the highest quality aircraft aluminum available. This model has the versatility you want in a bipod with its 4 individual leg positions and 5 notch height options. It also has the ability to pan as well as cant" which can each be locked and secured individually with the adjustable lever. Their quick detach rail mount is simple" quick" and very secure; it attaches to a 1913 Picatinny rail and mounts in seconds without the need to use extra tools for tightening. To engage or adjust leg position" simply pull the spring-loaded leg downward to move each leg independently. Leg position can be deployed to 90 degree or 45 degree" locking securely into 4 positions. Please keep in mind the cant adjustment lever can be repositioned" DO NOT use a tool to tighten the canting tension.