Buck 691 Zipper Rubber — Precision Gut Hook Knife for Field Dressing

The Buck 691 Zipper Rubber is a purpose-built gut hook knife designed to deliver controlled, clean field dressing with every cut. Revered for its reliability, this model—often called “the Zipper” for the way the hook guides the cut—combines Buck’s enduring craftsmanship with practical engineering that you can trust in the field.

Rooted in Buck’s storied legacy, CJ Buck (the fourth generation) helped reshape gut hooks early on, delivering a design that truly performs when you need it most. This version brings that heritage to life with details engineered for real-world use.

Key features that set the Zipper Rubber apart

• 4¼" satin-finish blade crafted from 420HC stainless steel for dependable edge retention and rust resistance in harsh outdoor conditions
• Optimized gut hook geometry with an enhanced edge angle and hook length for smooth, precise incisions that minimize tissue damage and reduce effort
• Fixed blade design for maximum strength and straightforward maintenance in demanding field scenarios
• Texturized rubber handle delivers a secure, comfortable grip in wet or muddy environments, helping you maintain control during meticulous skinning and processing
• Black, heavy-duty nylon sheath provides rugged protection and easy carry on rugged terrain
• Balanced 6.6 oz (187.9 g) feel—reliable from first light to late finish, with a design that stays steady in your hand through long processing sessions

Why the Zipper Rubber shines in the field

When you’re at the critical moment after harvest, the gut hook slices cleanly along the tissue line, reducing resistance and boosting control—even when wearing gloves or working in damp conditions. The blade geometry and hook length are tuned to deliver consistent performance across different game sizes, helping you process efficiently without overworking your hand. The satin 420HC steel strikes a practical balance between sharpness, ease of maintenance, and durability in daily use.

Who benefits most

• Hunters who require precise, reliable gut work that minimizes tissue trauma and speeds up processing
• Outdoor enthusiasts and campers needing a rugged fixed blade for camp chores beyond field dressing
• Any outdoor practitioner who values Buck’s tradition of practical, field-tested design

Practical tips for optimal use

• Keep the edge sharp and clean after each use to maintain effortless slicing; dry thoroughly to extend edge life
• In cold or wet environments, maintain a firm grip on the rubber handle to preserve control during precise maneuvers
• Store in the included sheath when not in use to protect the blade and your gear on the move

Specifications at a glance

• Blade length: 4¼" (10.8 cm)
• Blade material: Satin finish 420HC stainless steel
• Fixed blade: Yes
• Handle material: Texturized rubber
• Weight: 6.6 oz (187.9 g)
• Carry system: Black, heavy-duty nylon sheath
• Model: BUCK691BKG

Buck Knives brings a heritage of hands-on practicality to your outdoor toolkit with the 691 Zipper Rubber—a reliable partner for field dressing, skinning, and everyday camp tasks. If you value precision, durability, and a knife built to perform in tough conditions, this model is engineered to meet your needs and stand the test of time.