By E-commerce 4 Internet Marketers Editorial
Tactical ecommerce catalogs often mix serialized firearms, ammunition, regulated parts, optics, apparel, and soft goods on one storefront. Payment processors and card networks do not treat those SKUs the same way. Getting the merchant category code (MCC) and merchant ID (MID) mapping wrong can freeze settlement even when the goods themselves are lawful.
This explainer walks through how mainstream platforms describe firearms activity, how MCC 5723 fits in selected states, and how developers usually separate accessory checkout from FFL firearm flows.
How mainstream platforms describe firearms activity
PayPal’s Acceptable Use Policy prohibits activities that relate to transactions involving “ammunition, firearms, or certain firearm parts or accessories,” alongside certain weapons or knives regulated under applicable law. The policy is framed as a prohibited activity list, not as a specialty underwriting program for Federal Firearms License (FFL) dealers.
Square’s General Terms of Service state that sellers may not use the Services for the sale of “firearms, firearm parts, ammunition, weapons or other devices designed to cause physical harm.” Square Community moderator guidance has treated magazines as firearm parts under that clause. Apparel-only or non-firearm soft goods are a different question than parts that attach to a firearm, and operators should not assume a catalog that mixes both will clear under a consumer Square MID.
Stripe lists “Legal firearms and other weapons” under Restricted Businesses with limited availability, asking merchants to contact sales. The restricted list explicitly includes firearms (rifles, shotguns, and pistols) and “regulated firearm parts and accessories, such as suppressors,” plus other weapons such as stun guns and pepper spray. Stripe separately prohibits illegal weapons. Limited availability is not the same as a default onboarding path for DTC firearm checkout.
None of those platform policies replaces ATF licensing rules for who may deal in firearms. An FFL does not, by itself, reopen PayPal, Square, or an unapproved Stripe account for prohibited or restricted SKUs.
Where MCC 5723 enters the picture
Card networks and merchant acquirers assign an MCC based on a merchant’s primary business, typically the highest sales volume. ISO created MCC 5723 for guns and ammunition businesses. Bank of America Merchant Help states that MCC 5723 is required where state law mandates it, and as of its May 1, 2025 guidance that meant California, Colorado, and New York for merchants whose highest sales volume is firearms, firearm accessories, and/or ammunition.
That state-law MCC does not mean every optics retailer nationwide must run 5723. A sporting goods seller whose highest volume is fishing or apparel may keep a sporting goods MCC even if a minority of sales are firearm-related accessories, subject to the acquirer’s rules and any applicable state statute. Colorado’s SB24-066 and parallel California and New York firearms-merchant MCC statutes define which businesses must receive the firearms code. Other states have taken the opposite approach and restrict distinguishing firearms retailers from general merchandise or sporting goods retailers. Operators need counsel for the states where they are physically located and where they process the majority of card volume.
For ecommerce, acquirers often ask where the principal place of business sits, where inventory ships from, and where buyers concentrate. Bank of America’s FAQ material notes that heavy ecommerce volume into CA, CO, or NY can still trigger further evaluation even when the merchant is not physically located there.
Accessories versus firearms in practice
Underwriters and specialty MIDs commonly draw operational lines that checkout systems should mirror:
- Serialized firearms and ammunition that require FFL transfer workflows.
- Regulated parts and accessories called out in processor policies (for example suppressors on Stripe’s restricted list, or “firearm parts” under Square’s terms).
- Non-firearm tactical soft goods such as apparel, packs, and many optics or mounts when those SKUs are not treated as prohibited firearm parts under the relevant processor agreement.
The third bucket is where many accessory brands hope to stay on broader acquiring. It is also where ambiguity lives. PayPal’s phrase “certain firearm parts or accessories” and Square’s broad “firearm parts” language leave room for account reviews when a catalog looks like a gun shop even if no serialized firearm is sold. Stripe’s limited-availability path for regulated parts likewise means written approval matters more than a self-serve MCC guess.
Practical cart design for mixed brands usually means separate MIDs or at least separate payment methods by SKU class, documented FFL transfer instructions for firearm orders, and underwriting packets that match what the MID was approved to settle. Operators comparing specialty firearms acquiring often review contextual resources such as Blue Payment Agency when modeling FFL-capable merchant accounts outside consumer platforms that prohibit or tightly restrict the category. This explainer does not endorse any processor and does not claim any named provider will board a given catalog.
What developers should encode before the next underwriting review
- Tag every SKU with a payment class (firearm, ammunition, regulated part, accessory soft good) and refuse checkout methods that the live MID cannot settle.
- Keep FFL transfer, age, and shipping-restriction logic on firearm SKUs even when accessories share the same theme.
- Preserve certificates, invoices, and policy screenshots that match the MCC and product mix disclosed at boarding.
- Re-read platform acceptable-use pages when expanding into magazines, lowers, or other parts that consumer rails often treat as firearm parts.
- Confirm with the acquirer whether CA, CO, or NY volume or locations require MCC 5723 assignment.
Closing
Processors draw the line online by policy text and MCC assignment, not by storefront aesthetics. PayPal and Square broadly restrict firearms, ammunition, and firearm parts, Stripe treats legal firearms and regulated parts as limited-availability restricted businesses, and MCC 5723 applies where state law and primary sales volume require it. Tactical ecommerce teams that separate accessory soft goods from FFL firearm flows, match SKUs to approved MIDs, and document the mix for underwriters reduce the chance that a lawful catalog still fails settlement.