Altra Archery .166 Insert/Outsert 12 Pack

The Altra Archery .166 Insert/Outsert 12 Pack features the innovative Altra Reinforced Concentric Outsert System (A.R.C.O.S.), engineered to maximize durability, concentricity, and downrange accuracy. Precision machined from premium 7075-T6 aluminum, the ARCOS system reinforces the front of the arrow shaft while creating a highly concentric connection between the insert, outsert, and point. Designed specifically for Altra .166 arrow shafts, this advanced component system helps serious archers achieve superior arrow performance in both hunting and target applications.

Key Features

• Designed specifically for Altra .166 arrow shafts
• ARCOS (Altra Reinforced Concentric Outsert System) design
• Precision machined from 7075-T6 aluminum
• Exceptional front-end shaft reinforcement
• Improves concentricity for enhanced accuracy
• Integrated O-ring system reduces vibration
• Accepts Micro FMS insert weights
• Built for hunting and target archery applications

Advanced ARCOS Technology

The Altra Reinforced Concentric Outsert System was developed to strengthen one of the most critical impact areas of an arrow while improving overall shooting performance. The insert extends 0.875 inches into the shaft while the threaded outsert encapsulates 0.43 inches of the shaft's leading edge, creating exceptional durability and structural integrity.

Pre-installed rubber O-rings help secure the outsert to the insert, reducing vibration while improving concentricity between components. This precision alignment helps promote more consistent arrow flight, tighter groupings, and increased confidence downrange.

Manufactured from premium 7075-T6 aluminum, the ARCOS system offers an ideal balance of strength, weight, and precision for serious bowhunters and target archers alike.

Quick Specs

• Brand: Altra Archery
• Product: ARCOS Insert/Outsert System
• Quantity: 12 Pack
• Material: 7075-T6 Aluminum
• Total Weight: 50 Grains
• Arrow Compatibility: Altra .166 Shafts
• Insert Weight Compatibility: Accepts Micro FMS Insert Weights
• Insert Depth: 0.875"
• Outsert Coverage: 0.43"

Available Spine Options

• 250 Spine
• 300 Spine
• 350 Spine
• 400 Spine

Compatibility / Works With

• Altra .166 Arrow Shafts
• Micro FMS Insert Weights
• Fixed Blade Broadheads
• Mechanical Broadheads
• Field Points
• Phantom Arrow Builds
• Bowhunting Arrow Setups
• Target Archery Arrows

Best For

• Building high-performance hunting arrows
• Improving front-end arrow durability
• Increasing arrow concentricity
• Long-range shooting setups
• Broadhead-tipped arrows
• Precision target archery
• Advanced arrow tuning
• Custom arrow builds

Frequently Asked Questions

What arrows is this ARCOS system designed for?

The .166 ARCOS Insert/Outsert System is specifically designed for Altra .166 arrow shafts.

What material is the ARCOS system made from?

The insert and outsert are precision machined from premium 7075-T6 aluminum for excellent durability and performance.

How much does the system weigh?

The complete ARCOS Insert/Outsert System weighs 50 grains.

Can I use insert weights with this system?

Yes. The ARCOS system accepts Micro FMS insert weights for additional front-of-center tuning and arrow customization.

What type of target should be used with ARCOS-equipped arrows?

Altra recommends using foam-style archery targets. Bag-style targets may cause the outserts to become lodged in filler material, potentially damaging the insert/outsert system or arrow shaft.

Important Target Recommendation

For maximum component life and performance, Altra Archery recommends shooting ARCOS-equipped arrows into foam-style targets. This helps prevent damage that can occur when outserts become trapped in traditional bag-style target fillers.

Built for Strength. Tuned for Accuracy.

Whether you're building premium hunting arrows or fine-tuning a competition setup, the Altra Archery .166 Insert/Outsert 12 Pack delivers the durability, concentricity, and precision needed to maximize arrow performance and confidence with every shot.