California’s AB 1263 changes how you order firearm parts—and if you’re a gun owner who customizes your sidearm with aftermarket components, you need to know what’s coming before January 1, 2026. The new law introduces verification requirements that will affect every online parts order shipped to the Golden State.
What Does California AB 1263 Require?
The law adds verification requirements for the sale and delivery of firearm parts to California residents. Under the new legislation, retailers must verify a customer’s age and shipping address for all tools, parts, or part sets that are “clearly designed and intended for use in manufacturing firearms.”
This sweeping language has created concern among firearm enthusiasts who regularly purchase Glock parts and accessories, Sig Sauer upgrades, and other aftermarket components for their firearms.
Parts Likely Affected by AB 1263
The legislation’s broad language means a wide range of components will fall under these new requirements, including:
- Triggers and trigger components
- Short reset systems
- Grip modules
- Custom slides and barrels
- Potentially spring kits, recoil springs, and even grip screws
The vague wording of “clearly designed and intended for use in manufacturing firearms” creates uncertainty about exactly which products will require the additional verification steps. For those looking to upgrade their firearms, this may affect purchases of components like those covered in our Glock 43X & P365 Slide Upgrade Guide.
New Purchase Requirements for California Customers
Starting January 1, 2026, orders containing affected parts shipped to California will require:
- Acknowledgment checkbox – Confirming understanding of California law with a link to the legislation’s text
- Age verification – Providing a current state ID (driver’s license) to verify you are 18 years or older
- Address matching – Orders must ship to the address on your driver’s license
- Adult signature confirmation – Using USPS Adult Signature Confirmation or similar FedEx/UPS services, which require someone 21 or older to sign for the package
The Age Requirement Conflict in AB 1263
There’s an inherent conflict in the law worth noting: while the legislation allows individuals 18 and older to purchase parts, the Adult Signature Required services from USPS, FedEx, and UPS all define “adult” as 21 years or older. This means customers between 18-20 may face additional challenges receiving their orders.
Impact on Retailers and Customers
The new requirements create significant logistical challenges for firearms parts retailers nationwide. Companies must now implement verification systems that:
- Verify customer age before processing orders
- Confirm shipping address matches state-issued ID
- Handle sensitive personal information securely
- Comply with California’s Consumer Privacy Act (CCPA)
Many retailers are evaluating third-party verification services that can confirm age and address without storing copies of customers’ state IDs, which are considered sensitive personal information under CCPA.
eBay Policy and AB 1263: What You Need to Know
If you’ve purchased firearm accessories through eBay in the past, AB 1263 compounds an already restrictive marketplace. Here’s the reality:
eBay’s Existing Firearms Policy
eBay’s firearms policy already prohibits complete firearms, receivers (even incomplete), all ammunition, and many accessories. The platform explicitly bans:
- Assault weapon parts and accessories
- High-capacity magazines (over 10 rounds)
- Flash suppressors, silencers, and barrel shrouds
- Forward pistol grips and threaded barrels for semi-automatic pistols
- Bump stocks and frame kits
Even items eBay does allow—like barrels, slides, triggers, and firing pins—must comply with California state law as a baseline requirement for all listings.
AB 1263 Creates a Double Compliance Problem
Starting January 1, 2026, AB 1263 adds state-level verification requirements that eBay sellers likely cannot fulfill through the platform’s existing infrastructure. The law requires:
- Government ID verification before purchase
- Signed written acknowledgment of California law
- Address matching with verified ID
- Adult signature delivery confirmation
eBay’s checkout process doesn’t support these verification steps. The result? Many eBay sellers have already announced they’ll stop shipping firearm parts to California entirely rather than risk non-compliance penalties.
What This Means for California Buyers on eBay
Expect significant changes when searching for firearm parts on eBay after January 1, 2026:
- Reduced availability – Sellers adding “will not ship to California” disclaimers
- Higher prices – Sellers who attempt compliance will pass verification costs to buyers
- Shipping delays – Adult signature requirements add delivery complexity
- Account restrictions – eBay may increase enforcement on California-bound shipments to ensure platform-wide compliance
Industry analysts expect this combination of eBay’s existing restrictions plus AB 1263 compliance burdens to push California buyers toward direct manufacturer relationships and FFL transfers.
The Bottom Line for eBay Shoppers
If you’re a California resident who has relied on eBay for firearm accessories, it’s time to establish relationships with compliant retailers who can meet AB 1263 requirements. While NDZ Performance maintains an official eBay store for customers in other states, California residents should order directly from ndzperformance.com where we’re implementing the verification systems necessary to continue serving you after January 1, 2026.
What This Means for California Gun Owners
If you’re a California resident who purchases firearm parts online, expect the following changes after January 1, 2026:
- Longer checkout process – Additional verification steps at time of purchase
- ID requirements – Need to provide state-issued identification
- Shipping limitations – Must ship to address on your ID
- Signature required – Must be present (or have someone 21+ present) to sign for deliveries
- Potential delays – Some retailers may pause California shipments while implementing compliance systems
This is particularly relevant for enthusiasts who enjoy customizing their firearms. Whether you’re following our Complete Glock Clone Assembly Guide or upgrading your carry gun with a heavyweight guide rod, these new requirements will affect how you receive parts.
Order Now Before the Deadline
With the January 1, 2026 deadline approaching, now is the time to get your parts ordered. Don’t wait until retailers are scrambling to implement new compliance systems—place your orders before mid-December to ensure delivery before the law takes effect.
End of Year Sale: 10% Off Before AB 1263 Takes Effect
Here’s the good news: our End of Year Sale runs through December 31, 2025—giving you the perfect opportunity to stock up on parts before AB 1263 kicks in. Get 10% off rear slide plates, magazine floor plates, triggers, mag releases, guide rods, and more. No coupon needed—discounts apply automatically at checkout.
Plus, orders over $60 ship free to the continental U.S. This is your last chance to upgrade without the extra verification hassle.
Popular upgrades on sale:
- Custom rear slide plates with laser-engraved designs
- Magazine floor plates for added grip and personalization
- Triggers and extended controls
- Guide rods with premium DLC finish
If you’ve been considering upgrades to your Sig Sauer, check out our SIG P365 Fuse Upgrade Guide or browse our selection of Sig P365 accessories.
Looking Ahead: The Future of Firearm Parts Shipping to California
AB 1263 represents another layer of regulation for California firearms owners. While the stated intent is to add accountability to firearm parts sales, the broad and sometimes vague language of the legislation has created uncertainty for both retailers and customers about exactly which products fall under its scope.
We’ll continue monitoring the implementation of AB 1263 and provide updates as retailers and customers adapt to the new requirements. If you have questions about how this may affect your orders, reach out—we’ve got your back.
For more tips on upgrading your firearm, check out our Pistol Optics Installation Guide for expert techniques.
For the full text of California Assembly Bill No. 1263, visit the California Legislature website. For eBay’s firearms policy, see their official policy page.