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The Geissele Super Duty Build kit boasts quality and workmanship that is characteristic of the Geissele brand. The kit comprises a complete upper chambered in 5.56mm, showcasing a Nanoweapon-coated Surefire Closed-Tine Flash Hider secured to an in-house durable black oxide coated, Cold Hammer Forged, Chrome Lined, 1-7 twist Geissele barrel. Precision machining and use of top-quality materials at their state-of-the-art facility in North Wales, PA make Geissele barrels a cut above the rest. The Geissele Length gas system teamed up with the Geissele Super Compact Gas Block makes for optimal performance even in extreme conditions or heavy use.

In addition, the kit includes the MK16 Super Modular rail that attaches to the upper receiver via a center-aligning tab eliminating the possibility of rail rotation. This MK16 rail is a variation of the SMR MK16 fielded by USASOC and recognized for its exceptional performance, comfort, and adaptability.

At the core of this upper receiver group is the Geissele REBCG (Reliability Enhanced Bolt Carrier Group). This Nanoweapon-coated BCG features a properly torqued and staked, chrome-lined gas key. The Cam Pin is constructed from advanced tool-steel and coated with Nanoweapon for maximum corrosion and wear resistance. The REBCG boasts extended upper rails offering greater stability and significantly enhancing feeding reliability. Furthermore, the REBCG boasts the Geissele Stressproof Bolt made from Carpenter 158+ steel. The Stressproof bolt was developed through direct collaboration with Carpenter Steel metallurgists to create a material that is cleaner and has fewer impurities than regular bolts, boosting its strength and fatigue resistance. The Geissele Stressproof bolt is forged and not machined from barstock, thereby optimizing the grain structure of the steel resulting in a bolt capable of five times the lifespan of a mil-spec bolt. Each bolt undergoes rigorous inspection, high-pressure testing, mag particle inspection, and finally, Nanoweapon coating.

The Geissele Ultra Duty Lower Parts Kit is designed for highly demanding operators and includes all internal parts necessary to complete or revamp your lower receiver. This top-of-the-line LPK features proprietary Geissele designs meticulously machined at their facility located in North Wales, PA. Modeled with Stainless Steel, this LPK guarantees a much longer life-span with an exceptionally low chance of rusting or failing even in extreme conditions or heavy use. It includes the Maritime Bolt Catch, lauded for its aggressive texturing and extended paddles; and the Ambidextrous Super Configurable Safety, which allows for easy and secure swapping as well as exchanging of the safety levers and provides the shooter with a satisfying and positive tactile feedback when the safe or fire position is engaged. The takedown pins and mag release button also feature the same "tank treading" as the Maritime Bolt Catch, providing a tasteful and cohesive look. Furthermore, the Ultra Duty LPK includes Geissele's Ultra Precision Trigger Guard, which is 5-axis machined from a solid block of billet 7075-T6 aluminum and finished with Type-3 hardcoat anodize, ensuring that your build stands out from any other. Every component is crafted with the aim of enhancing the usability of the AR platform by facilitating more tactile engagement and easier access to critical control components.

The SSA-E X with Lightning Bow® trigger, usually exclusive to Super Duty firearms, is also included in this kit. This Nanocoated two-stage trigger boasts a wide body and bow shape striking the perfect balance between a classic M4 trigger and a flat body trigger. With light and clean first and second stage pull weights, the SSA-E X offers a smooth light first stage take-up and an ultra-crisp second stage break.

The Geissele Premium Mil-Spec Buffer Tube, machined from quality 7075-T6 Aluminum and finished in Type 3 Hardcoat Anodize, conforms to all mil-spec standards and comprises six preset stock positions. This carbine-length, mil-spec diameter Premium Buffer Tube is the perfect fit for your AR-15 lower. Furthermore, it includes a high-quality, Mil-Spec castle nut and end plate.

The Geissele Super 42 Buffer Spring and Buffer Combo serves to improve the functioning and reliability of the AR-15 pattern rifle. Its unique spring design employs three independent strands of wire, similar to the famous German MG42 Machine Gun, providing harmonic damping and energy damping by enabling the strands to flex separately from each other. This property helps to displace excess energy, decreasing the likelihood of spring failure, and enhances reliability. The Geissele Super 42 Spring also has a 15% stronger average return force than the standard buffer spring, reducing the tendency to lose length and force over a given round count. Additionally, it eliminates the annoying spring reverberations (the “twang”) heard and felt through the buttstock by the shooter. As a result, your AR-15 is better equipped to strip rounds out of the magazine when operating with a dirty weapon or when using steel-case ammo.

The B5 stock currently used by the U.S. military is a reinforced polymer stock that fits AR-15/M4-type receiver extensions, featuring an improved cheek weld, designed for more comfort and consistency. The stock has two waterproof storage compartments along its length that can hold 2 AA or 3 CR-123 batteries. To aid in safe and stealthy operation, streamlined contours prevent snagging on clothing, equipment, or vegetation. The Sure-Grip stock latch ensures convenient and intuitive length-of-pull adjustment, while the anti-slip rubber recoil pad secures the weapon to the operator's shoulder. The stock comes with a stainless-steel QD swivel mount and two molded 1¼" wide sling slots.

The Geissele A22 Grip is a contemporary take on a classic grip angle for the AR15/M4 platform. It incorporates a similar angle as the venerable A2, including the iconic finger swell. The Geissele A22 Grip is complete with an attractive anti-slip texturing and thicker palm swell to facilitate an easy high-and-tight hold.