Fastarmed Auto-Eject Biometric Gun Case - Home Model. Base attachment and all three calibration pins are included as standard features. Upon touching the biometric fingerprint scanner, the quick access, auto-eject feature deploys the firearm directly into the owner's hand. Armed in one second! Restrictions apply: Firearm/pistol barrel must not exceed 4.5 inches. Only stock, semi-automatic pistols can be used. No modified or custom pistols. Acceptable firearm sizes: 9mm, .380, .357, 380 special, .40, 10mm, .45 (See instruction manual to determine the correct caliber pin to use for your firearm).