California maintains some of the most intricate firearms and accessory regulations in the nation. To ensure a seamless, transparent checkout and delivery experience, this guide outlines state requirements for purchasing Micro Conversion Kits (MCKs), firearm magazines, extended/threaded barrels, and general accessories under California Penal Code § 30515, Penal Code § 32310, Assembly Bill 1263 (AB 1263), and Senate Bill 704 (SB 704).
Review product availability, required shipping pathways, and legal restrictions for California residents below:
| Firearm Item / Accessory | Can We Ship to CA? | CA Delivery Method | Key Legal Restriction / Compliance Rule |
| Magazines (>10 Rounds) | ❌ No | N/A | Prohibited under Cal. Penal Code § 32310. |
| Compliant Magazines (10 Rds Max) | ✅ Yes | Direct to Door | Fully legal (10-round max or factory 10/30 blocked options). |
| Uninstalled Conversion Chassis | ✅ Yes | Direct to Door | Legal to ship; uninstalled chassis is a non-serialized accessory. |
| Pistol Kit w/ Shoulder Stock | ✅ Yes (Uninstalled) | Direct to Door | Attaching stock to a handgun inside CA creates an SBR / Assault Weapon. |
| Standalone Barrels (Any Type) | ✅ Yes | Must Ship to FFL | SB 704 mandates FFL transfer for all standalone firearm barrels. |
| Threaded Pistol Barrels | ⚠️ Restricted | Must Ship to FFL | Installing on semi-automatic handgun inside CA creates an Assault Weapon. |
| Standard Accessories (Grips, Optics) | ✅ Yes | Direct to Door | Requires AB 1263 age/ID verification & Adult Signature delivery. |
Direct-to-Door Chassis Shipping: Because conversion kits contain no serialized receiver or firing mechanism, standalone chassis (bare, brace-equipped, or stock-equipped) are classified as firearm accessories and ship directly to your California residential address. No FFL transfer is required for uninstalled chassis orders.
Stock-Equipped Conversion Kits: Attaching a shoulder stock to a semi-automatic handgun creates a Short-Barreled Rifle (SBR) under federal and state law. Because California heavily restricts civilian SBR ownership, stock-equipped chassis are typically purchased for out-of-state matches, training courses, or property use where legally permitted.
Stabilizing Braces & Feature Regulations: Under Cal. Penal Code § 30515, inserting a semi-automatic pistol with a detachable magazine into a chassis inside California may trigger restricted feature rules (e.g., secondary forward grip or barrel shroud). Pairing your setup with a CA-compliant fixed-magazine device keeps your assembled build clear of restricted feature violations.
10-Round Limit: Under state law, it is unlawful to manufacture, import, sell, or offer for sale any ammunition feeding device capable of holding more than 10 rounds. Commercial shipments into California are strictly capped at 10 rounds.
Compliant Options: Standard 10-round factory magazines and factory-pinned 10/20 or 10/30 magazines (full-size magazine bodies permanently restricted to 10 rounds) are fully legal to ship directly to your door.
Mandatory FFL Shipping for Barrels (SB 704): Standalone firearm barrels (handgun, rifle, or shotgun) cannot ship directly to a residential address in California. All standalone barrel orders must ship to a California-licensed Federal Firearms Licensee (FFL) for in-person pickup.
Threaded Pistol Barrel Restrictions: Installing a threaded barrel onto a semi-automatic handgun in California creates an Assault Weapon under Cal. Penal Code § 30515(a)(4)(A).
Online orders for firearm parts, conversion kits, and tactical accessories shipped to California addresses must satisfy state verification requirements prior to order processing:
Age & ID Verification: Buyers must be at least 21 years of age.
Address Matching: The order shipping address must match the customer's government-issued photo ID exactly.
Signed State Acknowledgment: Customers must complete a digital state-mandated acknowledgment confirming lawful intended use during checkout.
Adult Signature Delivery: Shipments containing regulated firearm accessories require an Adult Signature (21+) upon carrier delivery.
💡 PRO TIP: When placing an order for accessories or a conversion kit shipping to California, double-check that your checkout shipping address matches the address printed on your driver's license or government ID! Mismatched addresses will cause automatic order holds under AB 1263 compliance rules.
⚖️ Important Regulatory Disclaimer: This guide is provided for educational and informational purposes only and does not constitute formal legal advice. California firearms laws (including Cal. Penal Code § 30515, § 32310, AB 1263, and SB 704) are subject to ongoing legislative updates and judicial challenges. Always consult a qualified California firearms attorney or the California Department of Justice (DOJ) Bureau of Firearms to verify regulations for your specific setup.