Altra 204 Insert and Outsert 400 Spine

Engineered for precision archery, the Altra 204 Insert and Outsert 400 Spine is crafted for Altra Arrows 204 shafts. It delivers durable performance with consistent flight and easy tuning for serious shooters.

• Compatibility: Fits Altra Arrows 204 shafts with four spine options—250, 300, 350, and 400—for precise spine matching.
• Material: Made from 7075-T6 aluminum to provide strength and stiffness under field or target shooting conditions.
• Insert depth: Secure insert seating depth of 0.875 inches to promote repeatable, accurate arrow setup.
• Outsert dimensions: Outsert encapsulates the arrow end with a 0.43-inch diameter for stable tip alignment.
• Vibration damping: Pre-installed rubber O-rings reduce vibration and improve concentricity for tighter groups.
• Weight: 53 grains total weight to help balance your arrow profile when paired with compatible inserts.
• Pack size: Supplied in a 12-pack, making it convenient to outfit multiple arrows or replace worn components.
• Insert weight compatibility: Accepts micro FMS insert weights for fine-tuning front-of-center balance and flight characteristics.

Together, these components enhance downrange accuracy and precision by delivering a stable, concentric assembly with vibration control. The durable aluminum construction, combined with configurable spine options and insert-weight compatibility, makes this a practical choice for target practice, field shooting, and competitive archery where dependable consistency matters most.