BATF a.k.a. ATF - Bureau of Alcohol, Tobacco, and Firearms.

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ATF Form 4473 - Federal requirement for very buyer regardless of status or type that purchases a Firearm must complete this form.

Firearm - Any Handgun; Lower Receiver; or Long Gun (Rifle or Shotgun).

FBI NICS Background - Any person acquiring a Firearm within the State of Arizona that does not have a AZ Concealed Carry Permit must under go a FBI Background Check.

NICS - National Criminal Background Check System. Established through the Brady Handgun Act of 1993. This is an FBI background evaluation to determine if the buyer is eligible to purchase and own a firearm.

Concealed Carry Permit - Issued by the State you permanent reside in.
Usually requires an application, finger print card, and background check plus a class on carrying a firearm and actual shooting range  qualifications.

Constitutional Carry - Some states including Arizona which are included allow residents over 21 to carry either open or concealed on person or in vehicle a legal firearm without a license concealed carry permit. Arizona enacted this law July 29, 2020.

NFA - National Firearms Act.

SOT License - NFA, National Occupational Tax License.

NFA Items - Items subject to the National Firearms Act such as Machine Guns, SBRs, SBSs, Heavy Weapons, Explosives, Suppressors, Improvised Homemade Firearms and Devices.

SBR - Short Barreled Rifle. A Rifle having one or more barrels that are less than 16 inches in length and an overall length of 26 inches. Individuals that make their own must complete a ATF Form 1, pay $200.00 and acquire a Tax Stamp. This requires Finger Printing and a Passport type colored photo. The form can be sent in electronically or by snail mail. If an individual acquires such an item through a licensed FFL, they must complete Form 4 with the same process. The item must have a serial number and the person must be 21 or older. If there is NO serial number on an NFA item, one must be laser engraved.

SBS - Short Barrel Shotgun. Any shotgun having one or more barrels less than 18 inches and 26 inches overall length. Individuals that make their own must complete a ATF Form 1, pay $200.00 and acquire a Tax Stamp. This requires a Finger Printing and a passport type colored photo. The form can be sent in electronically or by snail mail. If an individual acquires such an item through a licensed FFL, they must complete Form 4 with the same process. The item must have a serial number and the person must be 21 or older. If there is NO serial number on an NFA item, one must be laser engraved.

Note: Any NFA item requires a Tax Stamp and the tax stamp is only valid for one item. This includes so-called homemade devices.

Class 3 (III) Weapons - Machine Guns, SBRs, SBSs, Heavy Weapons, Explosives, Suppressors, Improvised Homemade Firearms

1898 Rule - Any Firearm including replicas made in 1898 or before are exempt from ATF rules for purchases. These are designated as Antique Firearms or ‘Other’ by the ATF.

Types of ATF Licenses -
Type 01 - Firearm Dealer / Gunsmith
Type 02 - Pawnbroker / Pawn Shop Owner
Type 03 - Collector
Type 06 - Manufacture of Ammunition
Type 07 - Manufacturer of Firearms
Type 08 - Importer of Firearms
Type 09 - Dealer of Destructive Device
Type 10 - Manufacturer of Destructive Device

FEL - Federal Explosive License.

Federal Hazmat License - This generally fits into the category of Fireworks but also applies to the firearms related industry.

FFL Transfer - This is when a legal individual purchases a firearm, generally online, and ships it to a designated licensed FFL within the state they live. The FFL Licensee then does all the paperwork as though that firearm was purchased within that state, i.e. ATF Form 4473, and NICS FBI Background Check and any and all associated paperwork.

Legal Age for Firearms - 18 or older to purchase and own either a shotgun or rifle (not an NFA item). This includes the purchase of ammunition (ammo).

Legal Age for Handguns - Any person 21 or older who is not a felon and complies with all federal or state firearm restrictions.

Silencer - Technically nothing is a silencer because no matter how quiet it is, it still makes some noise, The official name is a Suppressor (see below).

What is a Suppressor - A suppressor is essentially a noise reduction device, often referred to as a Silencer. Reality is anything makes a noise, therefore the term Suppressor is correct. Large caliber handguns and rifles are more difficult to suppress noise than say a 22 Caliber. The noise is measured in Db (decibels). A suppressor is the most common NFA item bought and owned by legal firearm owners 21 years of age or older. The suppressor requires a ATF federal tax stamp, finger print card, passport colored photo, and a background check. All NFA items must have a serial number. The suppressor type is determined by the caliber of the firearm. It is common place for legal firearm owners to have more than one suppressor.

What is an Auto-SEAR - A Sear Trigger is a type of trigger that converts a firearm from semi auto to full auto.

What is a Binary Trigger - A Binary Trigger allows for one round to be discharged when the trigger is pulled and one round to fire when the trigger is released. This is as close to full auto legally you can get. The weapon essentially fires two rounds as fast as you can pull the trigger.