Geissele Automatics Ultra Duty AR-15 Lower Parts Kit, Black – No Fire Control Group

Geissele Automatics Ultra Duty AR-15 Lower Parts Kit, Black – No Fire Control Group

A Terran Gear USA favorite, the Geissele Automatics Ultra Duty Lower Parts Kit provides premium internal components for completing or rebuilding a compatible AR-15 lower receiver. Designed for demanding use, this black lower parts kit includes 19 standard parts, an Ultra Precision Trigger Guard, Geissele Maritime Bolt Catch, and an Ambidextrous Super Configurable Safety, while leaving trigger and grip selection in the builder’s hands.

Premium Components for a Complete Lower Build

The Ultra Duty LPK includes the essential non-fire-control components needed to outfit a compatible AR-15 lower receiver. Key components use stainless steel construction to support long-term durability and corrosion resistance under regular or hard use.

Geissele Maritime Bolt Catch

Included is Geissele’s Maritime Bolt Catch, recognized for its aggressive texturing and extended paddles. The enlarged control surface is designed to provide a positive interface when operating the bolt catch.

Ambidextrous, Configurable Safety

The Ambidextrous Super Configurable Safety allows the user to swap and configure safety levers securely. Its design provides tactile feedback when moving between Safe and Fire positions, helping support confident rifle manipulation.

Ultra Precision Trigger Guard Included

The kit includes Geissele’s Ultra Precision Trigger Guard, machined from billet 7075-T6 aluminum and finished with Type III hardcoat anodizing. The trigger guard adds a durable, refined component to a matched AR-15 lower receiver build.

Key Features

• Geissele Automatics Ultra Duty Lower Parts Kit for compatible AR-15 lowers
• Black finish
• Includes 19 standard parts and hex key
• Includes Geissele Maritime Bolt Catch
• Includes Ambidextrous Super Configurable Safety
• Includes Ultra Precision Trigger Guard
• Trigger guard machined from billet 7075-T6 aluminum
• Type III hardcoat anodized trigger guard finish
• Key components constructed from stainless steel
• Does not include a fire control group or pistol grip

Specifications

• Brand: Geissele Automatics
• Product Type: Lower Parts Kit
• Platform: AR-15
• Color: Black
• Included Parts: 19 standard parts, including hex key
• Included Bolt Catch: Geissele Maritime Bolt Catch
• Included Safety: Ambidextrous Super Configurable Safety
• Included Trigger Guard: Ultra Precision Trigger Guard
• Trigger Guard Material: Billet 7075-T6 aluminum
• Trigger Guard Finish: Type III hardcoat anodized
• Manufacturer Part Number: 05-435B
• UPC: 817953025314
• Subcategory: Long Gun Parts

Compatibility

• Designed for compatible AR-15 lower receiver builds and rebuilds
• Compatible with builds requiring a separately selected AR-15 fire control group
• Suitable for builders who prefer to choose their own pistol grip and trigger configuration

Not Included

• Fire control group
• Pistol grip

Not Compatible With

• AR-10, LR-308, and other large-frame rifle lower receiver configurations
• Non-AR-15-pattern lowers with proprietary internal component dimensions

Important Notes

• This kit does not include a trigger, hammer, disconnector, or other fire-control components.
• A compatible pistol grip must be selected separately.
• Verify compatibility of all lower receiver, trigger, grip, and fire-control components before installation.
• Follow all applicable laws and safe firearm assembly practices.

Frequently Asked Questions

Does the Geissele Ultra Duty Lower Parts Kit include a trigger?

No. This lower parts kit does not include a fire control group, allowing you to choose a compatible trigger separately.

Does this lower parts kit include a pistol grip?

No. A pistol grip is not included.

What is included in the Ultra Duty LPK?

The kit includes 19 standard parts, a hex key, Geissele Maritime Bolt Catch, Ambidextrous Super Configurable Safety, and Ultra Precision Trigger Guard.

What is the Geissele Maritime Bolt Catch?

It is an included bolt catch with aggressive texturing and extended paddles designed for a positive operating surface.

Is the safety selector ambidextrous?

Yes. The kit includes Geissele’s Ambidextrous Super Configurable Safety with interchangeable safety lever capability.

What is the Ultra Precision Trigger Guard made from?

The included Ultra Precision Trigger Guard is machined from billet 7075-T6 aluminum and Type III hardcoat anodized.

Will this work with an AR-10 or LR-308 lower?

No. This kit is intended for compatible AR-15 lower receiver configurations.

What is the manufacturer part number for this kit?

The manufacturer part number is 05-435B.

Equip Your AR-15 Lower with Geissele Ultra Duty Components

For builders who want premium lower-receiver controls and the flexibility to select their own trigger and grip, the Geissele Ultra Duty Lower Parts Kit is a capable foundation. Complete your compatible AR-15 lower with durable, purpose-built Geissele components designed for demanding use.