Coverage & terms

Warranty

All builds completed by Marble Duck are covered by a limited workmanship warranty for a period of one year from the date of delivery. This warranty covers defects in materials and workmanship that originate from the build process itself.

This warranty is non-transferable and applies only to the original purchaser. It does not cover normal wear, user-induced damage, or issues arising from the use of non-standard or customer-supplied parts beyond my ability to inspect and certify. The table below outlines specific coverage determinations for common issues.

If you believe your build has a warranty-eligible defect, contact me at muir@marbleduck.com before shipping anything. I will not accept warranty returns without prior authorization.

Issue	Coverage	Notes
Failure to feed / eject Consistent malfunctions under normal operating conditions with standard ammunition	Covered	Covered when caused by headspacing, timing, or feed geometry issues attributable to the build. Not covered if caused by specific non-standard magazines or ammunition outside spec.
Weld or fastener failure Cracking, loosening or separation at any welded, pinned or riveted joint	Covered	Covered unconditionally for the warranty period. Proper fit and assembly of parts is entirely my responsibility.
Receiver cracking Cracks originating at stress points on the receiver	Case by case	Covered if the crack originates from a build defect or improper fitment. Not covered if attributable to customer-supplied receiver blanks, over-pressure ammunition, or evidence of abuse.
Barrel / crown damage Damage to the muzzle crown or barrel	Excluded	Crowns are inspected and documented before shipping. Damage after delivery is considered user-induced unless there is clear evidence of a manufacturing defect.
Finish wear or corrosion Wear, chipping, or rust on applied finish	Excluded	Surface finishes (Moly Resin, Cerakote, parkerizing) are wear items. Normal holster, rack, and handling wear is not covered. Corrosion due to improper storage or cleaning is excluded.
Headspace or bolt gap out of spec Go/no-go gauge failure after delivery	Covered	All builds are headspaced and documented before shipping. If headspace is out of spec on delivery, this is covered without question. A sudden or extreme increase in bolt gap or headspace beyond normal wear is covered under warranty.
Customer-supplied parts failure Failure of parts supplied by the customer	Excluded	I cannot warrant parts I did not source. If a customer-supplied part fails and causes secondary damage to the build, that damage is also excluded.
Accuracy / MOA performance Failure to meet stated accuracy specifications	Case by case	Where accuracy guarantees are stated (this is entirely a case-by-case basis, and agreed upon with the buyer on initiation of a project), failure to meet those specs with the recommended load is covered. General accuracy complaints without documented testing are not.
Magazine compatibility Failure to feed with specific magazines	Partial	Covered for magazines specified in the build agreement. Compatibility with aftermarket or customer-supplied magazines outside the tested set is not guaranteed.
Damage from over-pressure ammunition Any damage caused by +P, proof loads, or handloads	Excluded	Use of ammunition outside SAAMI/CIP specifications immediately voids the warranty for any damage caused thereby.
Post-delivery modifications Work performed on the build by a third party after delivery	Excluded	Any modification or repair performed by another gunsmith or the owner after delivery voids the warranty for the affected components and any parts they interact with.

Additional terms

Warranty service is return-to-shop only. I do not dispatch or reimburse for local gunsmith repairs.
I pledge to make every effort to respond to claims in a timely manner. In the event of non-availability due to deployment, overseas duty, or extended absence, I will work directly with the buyer to determine the appropriate course of action to make the buyer whole.
Return shipping to me is the customer's responsibility. I cover return shipping on confirmed warranty repairs.
Turnaround on warranty work is typically 2–3 weeks depending on current order volume.
Warranty claims must be initiated within the one-year coverage window. Builds showing evidence of neglect, abuse, or improper storage may be denied at my discretion.
This warranty gives you specific legal rights. You may also have other rights which vary by state.

To initiate a warranty claim, email muir@marbleduck.com with your order details, a description of the issue, and photos if possible. Do not ship without prior written authorization.