Geissele Automatics Ultra Duty Lower Parts Kit – No Grip


DDC (Desert Dirt Color)

Product Description

The Geissele Ultra Duty Lower Parts Kit is made for the most demanding operators and includes all the internal parts necessary to complete or rebuild your lower receiver. This top-tier LPK features proprietary Geissele designs, machined with great care at our facility located in North Wales, PA. Key components are made from Stainless Steel, which offers a much longer life-span and a much lower chance of rusting or failing in extreme conditions or under heavy use. The Geissele Ultra Duty LPK includes our Maritime Bolt Catch, famous for its aggressive texturing and extended paddles, and our Ambidextrous Super Configurable Safety, which features the ability to easily and securely swap and exchange the safety levers plus provides the end user a satisfying and positive tactile feedback when the safe or fire position is engaged. The takedown pins and mag release button feature the same tank treading as the Maritime Bolt Catch, giving your firearm a tasteful and cohesive look. Included in the Ultra Duty LPK is Geissele’s Ultra Precision Trigger Guard, 5-axis machined out of a solid block of billet 7075 -T6 aluminum and Type-3 hardcoat anodize to ensure that your build stands apart from any other.

The Geissele Ultra Duty Lower Parts Kit

1. Takedown Pin & Pivot Pin Detents (2)
2. Takedown Pin & Pivot Pin Springs (2)
3. Checkered Takedown Pivot Pin
4. Bolt Catch Plunger
5. Bolt Catch Spring
6. Bolt Catch Coiled Pin
7. Maritime Bolt Catch
8. Safety Detent
9. Buffer Retainer
10. Buffer Retainer Spring
11. Safety Detent Spring
12. Checkered Takedown Pin
13. Magazine Release Button
14. Magazine Release Spring
15. Super Configurable Safety Selector
16. Magazine Catch
17. Coiled Trigger Guard Pin
18. Geissele Ultra Precision™ 5 Axis Trigger Guard
19. Hex Key




Technical Information

Firearm Compatibility


5.56 NATO / .223 Remington

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit

Customer Reviews

Based on 5 reviews
Ian J.
Great kit

Solid lower parts kit really easy to add to a lower

Timothy M.
High quality hardware

This will be the third time I have used this LPK on a custom build. Far superior bolt catch/release interface, and the checkering on the takedown pins and mag release are an improvement.

Robert S.
Outstanding place to purchase!!!!

Factory Sealed perfect Condition!! Timing is everything.. if you can get the site discount with their other options.. flawless.

Awesome Shyt!

Absolutely amazing product! Fits nicely with the Geissele Lower, Geissele trigger, super42 buffer spring, H3 buffer and tube. Definitely worth the money!

Great product and company

Not too much I can say about the Geissele Ultra Duty Lower Parts Kit it will speak for its self....GUCCI! Milspec Retail on the other hand is something to talk about great prices, fast shipping, & instock notifications actually get sent. Thank you