The Pinnacle of Precision & Performance™ Phantom Altra Reinforced Concentric Outset System (A.R.C.O.S.) fits our Altra Arrows Phantom 166 Shafts and are machined out of 7075-T6 aluminum for unmatched durability and performance, with optimal fit options.

The insert secures into the arrow shaft at a depth of 0.875", while the outsert then threads directly onto the insert and encapsulates the leading end of the arrow at 0.43" creating unmatched durability.  Essential rubber O-rings come pre-installed on the insert within the A.R.C.O.S., as they aid in locking the outsert in place which reduces vibration and improves concentricity between the outsert to the insert for a more precise arrow set up and down range accuracy.

Features:

• Comes in 12 pk QTY
  
• Available in five sizes - 250, 300, 350, 400, & 500 spine
• 56gn Total Weight
  
• Accepts non-micro FMS insert weights

Altra Arrows highly recommends using a foam style arrow target when shooting arrows that have an ARCOS system, as the outserts can get stuck in filler of bag style targets which can damage the insert/outsert system or arrow.

Find Assembly Instructions HERE