Stamp Stack vs Armorer

Keep your NFA collection organized with Stamp Stack - the secure, private way to track your Form 4 approvals and tax stamps. Key Features: - Scan Form 4 documents with automatic text extraction - Track pending submissions and approved stamps - Monitor wait times and approval dates - Organize items by type: suppressors, SBRs, SBS, AOW, machine guns, and more - Manage NFA trusts and associated items - Secure cloud backup with end-to-end encryption - Biometric lock (Face ID / Touch ID) and PIN protection - Import documents directly from email Your Data, Your Control: All data is encrypted on your device before syncing to the cloud. Only you can access your information - we can't see your items, documents, or personal details. Perfect for: - Suppressor owners tracking wait times - Collectors managing multiple NFA items - Trust owners organizing shared items - Anyone waiting on Form 4 approval

Armorer is the firearm maintenance tracker built for serious shooters. Know exactly what every gun in your collection needs — and when it needs it. Track round counts, log maintenance, and set service intervals so you always know when a cleaning, spring replacement, or detail strip is due. Armorer works like a service record for your firearms, the same way you'd track oil changes and tune-ups for your vehicle. ROUND COUNT TRACKING Log every range session with ammo details including manufacturer, type, and grain weight. Running totals update automatically for every firearm you own. SERVICE INTERVALS Set maintenance intervals by round count or time. Armorer tells you when service is due before problems happen. Get notified 7 days in advance and on the due date. MAINTENANCE HISTORY A complete service log for every gun you own. Know exactly what was done, when it was done, and how many rounds ago. MALFUNCTION TRACKING Log failures by type — failure to feed, failure to eject, stovepipe, double feed. Spot patterns before they become reliability problems. GEAR & ACCESSORIES Track optics, lights, suppressors, and accessories with their own service intervals and battery replacement reminders. AMMO INVENTORY Track your stock on hand by brand, caliber, type, and grain. Deduct automatically when you log a range session. PRIVACY FIRST Serial numbers are zero-knowledge encrypted — only you can read them. We cannot access your serial numbers even if we wanted to. Your data is never sold or shared. Built by the team behind USA Carry, serving the concealed carry community since 2007. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://armorer.app/privacy.php