Easton 4mm FMJ Match Grade – Kauffman Custom Build

Ultra-Micro Diameter. Match-Grade Precision. Absolute Kinetic Momentum.

When maximum effective range meets heavy-boned western big game, the Easton 4mm FMJ Match Grade sits at the absolute pinnacle of arrow engineering. Fusing an ultra-micro .166" high-modulus carbon core with a precision-drawn 7075 aerospace aluminum jacket, this shaft delivers an elite ±.001" straightness tolerance across its full length. The ultra-thin profile cuts through mountain crosswinds, while the slick aluminum jacket minimizes friction upon impact for devastating pass-through energy. Paired with Easton's 4mm Match Grade 8-32 aluminum half-outs (55 gr), this build optimizes front-of-center balance without sacrificing broadhead seating strength.

At Kauffman Custom Archery, we take this flagship ultra-micro composite shaft and execute our full studio bench prep to guarantee broadhead-ready accuracy on every single arrow in your dozen.

The Kauffman Custom Studio Difference

Building ultra-micro aluminum-carbon shafts to ±.001" tolerances leaves zero room for error. We eliminate factory assembly flaws through a dedicated bench workflow:

• Static Spine Testing & Indexing: We statically test every shaft on our precision spine gauge to identify its principal stiff plane, ensuring uniform shaft flex and dynamic reaction out of the bow.

• Dual-End Diamond Squaring: Both ends are trimmed and precision-squared using diamond wheels, guaranteeing a 90-degree flush seat for 4mm Match Grade half-outs and micro nocks.

• Custom Hand Fletching: Shafts are thoroughly degreased, fitted with heavy-duty Onestringer custom wraps, and hand-fletched with high-profile micro vanes (Q2i Rapt-X or AAE Max Stealth) for maximum broadhead steering.

• Grain & Balance Sorting: Your entire set is weight-sorted across the dozen to ensure repeatable point-of-impact out to extreme distances.

Technical Specifications

• Shaft Inside Diameter: .166" (4mm Ultra-Micro Diameter)

• Construction: Micro High-Modulus Carbon Core with 7075 Aerospace Aluminum Jacket

• Straightness Tolerance: Match Grade ±.001"

• Insert System: Easton 4mm Match Grade 8-32 Aluminum Half-Outs (55 gr) or Optional Stainless Steel / Titanium Upgrades

• Nocks: Pre-installed 4mm Micro Nocks

• Spine Options: 250 (12.3 gpi), 300 (11.7 gpi), 340 (11.0 gpi), 400 (9.8 gpi)

Custom Build Options (Configured Above)

1. Select Your Spine: Matched precisely to your draw weight, draw length, and tip weight setup.

2. Precision Carbon Length: Clean-cut to your exact carbon-to-carbon specifications.

3. Front-End Weight Setup: Standard 55gr Match Grade Aluminum Half-Outs, Heavy Stainless Steel Half-Outs, or Titanium Half-Outs.

4. Custom Fletch & Wrap: Select wrap pattern, vane style, helical offset, and cock-vane accent color.

Want to test flight this shaft on your own setup before committing to a full dozen?

Order a single, bench-prepped sample arrow through our Test Flight Program. We will spine-index, dual-end square, wrap, and hand-fletch a single shaft to your exact specs and ship it straight to your door. Shoot it on your home range, test your broadhead flight, and use the included Store Credit Voucher directly toward your full dozen custom order!