The Altra 166 Outsert for Arrows 166 shafts is a purpose-built upgrade that sharpens precision and consistency for serious bowhunters and target archers who demand repeatable flight. Engineered to fit Altra Arrows 166 shafts, this outsert pairs rugged durability with precise tuning for improved downrange performance.

• Fits Arrows 166 shafts: Specifically designed to attach to Altra Arrows 166 shafts for secure, accurate alignment.
• Material: Machined from 7075-T6 aluminum for high strength-to-weight ratio and durability in variable field conditions.
• Secure insert depth: 0.875 inches, ensuring consistent seating and performance across shots.
• Outsert end encapsulation: Encases arrow end up to 0.43 inches for added protection and stability.
• Vibration reduction: Pre-installed rubber O-rings minimize vibration and improve concentricity during flight.
• Weight: 50 gn total weight to support precise weight distribution and tuning.
• Spine options: Available in 250, 300, 350, and 400 spine to match various arrow configurations.
• Pack quantity: Sold in a 12-pack to outfit a full set with consistent performance.
• Insert weight compatibility: Accepts micro FMS insert weights for fine-tuning front-to-back balance.

With this outsert installed, you’ll experience steadier arrow flight, tighter groups, and more predictable handling across shooting scenarios. The 0.875-inch insert depth yields repeatable seating, while the O-rings curb vibration that can throw off accuracy after release. The wide spine range and 12-pack convenience let you tailor a consistent tuning setup for different arrows, draw lengths, and poundage, then fine-tune with micro FMS weights for tuned front-of-center balance. Whether you’re dialing in a target setup, hunting rig, or 3D shoot, this outsert helps you extract every bit of precision from your Altra Arrows 166 shafts.