Geissele Ultra Duty AR-15 Lower Parts Kit
or 4 interest-free payments of $38.25 with 
6 Magazines Per Order: Due to extreme volume, we are limiting sales of magazines to 6 per customer order. This applies to individual and bundled magazines. AT3 reserves the right to cancel any order over the 6 magazine limit.
- Free standard shipping on orders $139+ details
- 90-day no-hassle returns policy
- Geissele Lifetime Warranty! what it covers
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Product description
Build Out Your Lower With Premium Super Duty Parts
Every part in the Ultra Duty Lower Patkit, from the stainless steel detents to the corrosion-resistant springs, is built to make your lower work when you might need it most. This premium LPK includes all essential mil-spec components, each meticulously manufactured to Geissele’s exacting standards for fit, finish, and function. Coming with Geissele’s Ultra Duty Checkered Takedown Pins, Ambidextrous Super Configurable Safety, and Super Duty Mag Catch brings this kit to another level, giving your rifle enhanced functionality and a superior feel as soon as you assemble it.
Features
- Mil-spec compatible and engineered for superior fit and feel
- Premium materials for unmatched reliability and corrosion resistance
- Ideal for duty, competition, or defensive builds
- Made in the USA and backed by Geissele’s reputation for excellence
Includes
| 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 |
Specifications
- Brand: Geissele
- Model: Ultra Duty AR-15 Lower Parts Kit
- MPN: 05-435S and 05-435B
- Fit: Mil-spec AR-15 Lower Receivers
- Material: Stainless Steel and Aluminum
- Finish: Type III Hardcoat Anodized
- Colors: Black and Dirt Desert Color (DDC)
All 2 options on this page
- Geissele Ultra Duty AR-15 Lower Parts Kit - Color: Black | SKU: 05-435B
- Geissele Ultra Duty AR-15 Lower Parts Kit - Color: Desert Dirt Color | SKU: 05-435S
Customer reviews 2
Verified buyerAT3 Tactical · Hi there! Thank you for taking the time to leave a review for our Geissele Ultra Duty AR-15 Lower Parts Kit. We're so glad to hear that you received it quickly and that our website was easy to use. We're also happy to know that the product arrived in perfect condition and has been performing flawlessly for you. Thank you for choosing AT3 and for your kind words. Happy shooting!
At3 was awesome in taking care of contacting Geissele for replacement. Only problem was Geissele sent me the mag catch but no release button. I didn’t bother contacting either since at this point I just wanted to get my lower ready for the range. I ended up just buying the magazine release locally. Thank you anyway.
Questions & Answers
No questions yet. Ask about fit, install or compatibility and our team answers within a business day.
Warranty & returns
Geissele Lifetime Warranty!
Geissele Limited Lifetime Warranty
- Geissele Automatics warrants its firearms, components, and tools against defects in materials and workmanship during the lifetime of the product.
- Geissele Automatics does not warrant against normal wear and tear, items consumed or expended by their normal use (including springs, pins, etc.), product misuse (including criminal misuse, negligence or use under the influence of drugs or alcohol), accidental damage, or damage caused by improper handling, unapproved modifications to the product, defective or improper ammunition, or corrosion.
- Defective accessories (e.g., scopes, suppressors, flash hiders, sights, slings, parts with glass or electronic components, etc.) may be warranted by their original manufacturers but are not covered by this warranty.
If you submit a valid claim under this Limited Lifetime Warranty, Geissele Automatics will authorize your return of the product and, at its sole discretion, will:
- Repair the product, including replacement of defective parts with new or refurbished parts
- Replace the product with a product of equal or greater value.
If Geissele Automatics decides to replace a product under this warranty, Geissele will keep the product being replaced.
You must satisfy all terms and restrictions set forth in this Limited Lifetime Warranty and obtain a Return Material Authorization before shipping any product to Geissele Automatics.
Before shipping any product to Geissele Automatics, please ensure the following:
- The product has not been modified, is clean and any accessories have been removed (unless otherwise instructed by a Geissele Automatics technical support agent)
- There is no ammunition in any product or packaging
- The completed Return Material Authorization form has been placed inside the packaging
- The Return Material Authorization number has been clearly written on the outside of the packaging.
Any failure to follow these instructions could result in your package being refused and returned to you without repairs at your expense.
To obtain service, contact Geissele Automatics at sales@geissele.com or 610-272-2060.
Disclaimer: Manufacturer’s warranty is subject to change without prior notice.
90-day no-hassle returns
The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.
If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.
