WMD Guns AR-15 Bolt Assembly - 5.56 NATO / .223 Rem / .300 Blackout - NiB-X Finish
or 4 interest-free payments of $15.75 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
- Backed by the WMD Lifetime Warranty! what it covers
Product description
Complete NiB-X Bolt with 9310 Steel Construction
Features
- Complete AR-15 bolt assembly for .223 Remington, 5.56 NATO, and .300 Blackout
- Case-hardened 9310 steel bolt provides strength for repeated locking and unlocking cycles
- Magnetic particle inspected for quality control
- WMD NiB-X nickel boron coating provides a hard, low-friction surface that resists fouling adhesion
- NiB-X finish makes carbon and residue easier to remove during routine cleaning
- High-performance extractor is installed as part of the complete bolt assembly
- Compatible with standard 5.56 AR-15 bolt carriers
- Made in the USA
The WMD Guns NiB-X Bolt Assembly is a complete replacement bolt for AR-15s using the standard .223/5.56 bolt face, including .300 Blackout builds. Its case-hardened 9310 steel construction and MPI inspection address the high-stress locking portion of the bolt carrier group, while WMD’s NiB-X coating provides a slick, wear-resistant surface that helps reduce fouling adhesion and simplifies cleanup.
Note: This is a complete bolt assembly, not a complete bolt carrier group. Bolt carrier, firing pin, cam pin, and firing pin retaining pin are not included.
Specifications
- Brand: WMD Guns
- Model: NiB-X Bolt Assembly
- MPN: 1-NIBXBA556
- Fit: AR-15 / M16 Compatible Bolt Carriers
- Caliber Compatibility: .223 Remington, 5.56 NATO, .300 Blackout
- Bolt Material: Case-Hardened 9310 Steel
- Inspection: Magnetic Particle Inspected
- Finish: NiB-X Nickel Boron
- Color: Silver
- Country of Manufacture: USA
What’s Included
- 1x WMD Guns NiB-X .223/5.56 Bolt Assembly
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Questions & Answers
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Warranty & returns
Backed by the WMD Lifetime Warranty!
WMD Guns Limited Lifetime Warranty on Coatings
- This warranty covers the products of WMD Guns for the failure of the NiB-X coating against chipping, peeling, or wear-through.
- The warranty is of unlimited duration. WMD Guns will recoat the product free of charge including return shipping costs.
- This warranty does not cover customer abuse at any time.
- This express limited warranty is the only warranty on this product. This product is sold “as is” and has no implied warranties of merchantability or fitness for a particular purpose.
- There are no warranties which extend beyond the description on the face hereof.
- WMD Guns shall not be responsible in any manner whatsoever for malfunctioning of the firearm, or for physical injury or property damage, resulting in whole or in part from:
- Criminal or negligent discharge
- Improper or careless handling
- Unauthorized modifications
- Defective, improperly hand-loaded, or reloaded ammunition
- Neglect
- Other influences beyond our direct and immediate control
- This limitation applies regardless of whether liability is asserted on the basis of contract, negligence, or strict liability (including any failure to warn).
- Under no circumstances shall WMD Guns be liable for incidental or consequential damages, such as loss of use of property, commercial loss, and loss of earnings or profits.
For questions regarding our warranty, please contact us at techsupport@wmdguns.com.
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.