5.2 Ammunition, Magazines, and Firearm Parts

5.2 Ammunition, Magazines, and Firearm Parts

Quick answer: Ammunition is prohibited in carry-on baggage. It may travel in checked baggage if it is packed in a fiber (such as cardboard), wood, plastic, or metal box specifically designed to carry ammunition and declared to the airline. Small arms ammunition up to .75 caliber and shotgun shells of any gauge are the published limits. Magazines and clips, loaded or empty, must be securely boxed or placed inside the hard-sided firearm case. You cannot use a magazine as ammunition packing unless it completely encloses the ammunition. Firearm parts — magazines, clips, bolts, and firing pins — are prohibited in carry-on and allowed in checked baggage.

Section 5.1 covered the assembled firearm. This section covers the ammunition and parts that turn a traveler's "it's just components" story into a checkpoint prohibited-item case. TSA's Transporting Firearms and Ammunition page and the dedicated Ammunition What Can I Bring item page are the sources. The ammunition item page states Carry On Bags: No and Checked Bags: Yes (Special Instructions). Special instructions are not a hint that a handful of loose rounds in a toiletry bag is fine.

Ammunition is never a carry-on item

TSA's rule is binary at the checkpoint: ammunition does not go in carry-on bags. That includes a few rounds in a pocket, a box of shotgun shells in a backpack, a speed loader in a purse, and a loaded magazine in a laptop sleeve. The civil-enforcement access rule from Section 5.1 still applies. If a firearm and ammunition are both accessible, TSA treats the firearm as loaded for penalty purposes even when the traveler insists the gun itself is empty.

Checked ammunition is allowed only when packed correctly. TSA requires small arms ammunition to be packaged in a fiber (such as cardboard), wood, plastic, or metal box specifically designed to carry ammunition. The dedicated ammunition item page lists fiber, wood, or metal boxes or other packaging specifically designed to carry small amounts of ammunition; the Transporting Firearms and Ammunition page also lists plastic. Use the fuller transporting-page list. A sock, a plastic grocery bag, a camera pouch, and the original cardboard sleeve crushed inside clothing are not "specifically designed" packing.

TSA points to 49 CFR 175.10(a)(8) for the hazardous-materials requirements that govern ammunition in checked baggage. You do not need to recite the Code of Federal Regulations section number on the TAB, but you do need the operational meaning: ammunition in passenger baggage is a regulated item, not a leftover hunting accessory. Declare it to the airline. Check with the airline for quantity limits. TSA does not publish a single nationwide round-count that overrides the carrier. Airline limits and fees control how much ammunition may fly.

Caliber and gauge are published. Small arms ammunition up to .75 caliber and shotgun shells of any gauge may be transported in that designed box. Do not invent a "hunting exception" for larger projectiles, and do not assume every metallic cartridge is small-arms ammunition just because it looks like a bullet on an X-ray image. Gun powder, including black powder and percussion caps, is a different item: the Gun Powder page lists Carry On Bags: No and Checked Bags: No. Reloading powder is not "ammunition in a box." Flares and flare guns are also No / No. Those items are explosives or signaling devices, not packed small-arms cartridges.

Ammunition may ride in the same hard-sided, locked case as the unloaded firearm if it has been packed as described — in the designed ammunition box, or in a magazine or clip that completely encloses the ammunition. That is a packing convenience, not a reason to skip declaration or to toss loose rounds into the corners of the gun case.

Magazines and clips: loaded or empty, still not carry-on

Travelers often treat an empty magazine as harmless plastic and spring. TSA does not. Firearm magazines and ammunition clips, whether loaded or empty, must be securely boxed or included within a hard-sided case containing an unloaded firearm. An empty magazine in a carry-on bag is a prohibited firearm part. A loaded magazine in a carry-on bag is a firearm part plus ammunition, which is two independent carry-on prohibitions and, if a firearm is also accessible, the civil-penalty definition of a loaded firearm.

TSA's packing sentence about using magazines as containers is specific: You cannot use firearm magazines or clips for packing ammunition unless they completely enclose the ammunition. A magazine that leaves cartridge noses or bases exposed is not a substitute for an ammunition box. If the magazine fully encloses the rounds, it can serve as the packing. Loaded or empty, those magazines still belong boxed or inside the locked hard-sided firearm case, not in a carry-on.

On an aptitude image, a magazine is often a dense rectangular body with a spring and follower and a feed-lip opening — not the full grip-trigger-barrel silhouette of an assembled handgun. That is still a prohibited carry-on item. Scattered magazines among clothing are a common "parts, not a gun" miss. The public rule is that the part is banned from carry-on even when the assembled firearm is absent.

Bolts, firing pins, frames, and other parts

TSA lists firearm parts, including magazines, clips, bolts, and firing pins, as prohibited in carry-on baggage and allowed in checked baggage. The list is inclusive ("including"), not a closed catalog. A traveler who disassembles a rifle so the receiver is in checked baggage and the bolt is in a carry-on "so it cannot fire" has still packed a prohibited carry-on firearm part. The safety story does not create a checkpoint exception.

Frames and receivers, and 3D-printed guns, are treated as firearms under TSA's civil-enforcement program, consistent with the ATF definition. They are not "just parts" that skip declaration. They remain prohibited at the checkpoint and must travel in checked bags under firearm packing and declaration rules. Silencers and suppressors appear on the Firearms, Firearm Silencers/Suppressors item page as Carry On Bags: No and Checked Bags: Yes (Special Instructions) — unloaded where applicable, locked hard-sided container, declared at check-in. Civil-enforcement guidance also lists silencers, mufflers, frames, and receivers as their own penalty category when they appear at the checkpoint or are undeclared in checked bags.

Holsters remain the accessory that is permitted in carry-on and checked bags. An empty holster on the belt image is not a firearm. Do not confuse that permission with permission for the magazine, the ammunition, or the gun.

Image aptitude: parts are still the prohibited category

Checkpoint image practice for this section is discrimination, not tradecraft. Ask whether the dense objects are:

• An assembled firearm silhouette (grip, trigger guard, barrel — Section 5.1).
• Ammunition: individual cartridges as small dense cylinders with a case, shoulder or crimp, and projectile; shotgun shells as plastic-bodied rounds with a metallic head.
• A magazine or clip: rectangular, spring/follower, not a complete gun.
• A bolt or firing pin: small, very dense rod-like metal, often among tools or toiletries.
• A scope: optical tube with glass, permitted in carry-on (Section 5.3).

Do not treat a dual-energy color as an official TSA published code. If a practice deck shows metals in blue and organics in orange, that is a screening-training convention, not a TSA.gov specification. The public decision is category: ammunition and firearm parts are carry-on No, checked Yes with packing rules. Gun powder is No in both.

This guide does not teach how to hide ammunition in a bag, how an officer's unpublished search procedure works, or how to assemble a firearm after screening. SSI and internal procedures stay in official TSO training.

Realistic scenario

Priya is flying to a hunting camp. She checks an unloaded rifle in a locked hard-sided case and keeps a box of .30-06 in her carry-on "so the ammo does not get lost," plus two empty magazines in the same backpack and the rifle's bolt in a toiletry kit. Every one of those carry-on choices violates a published TSA rule. Ammunition is prohibited in carry-on. Empty magazines are firearm parts prohibited in carry-on. The bolt is a firearm part prohibited in carry-on. The lawful packing is: ammunition in a designed fiber, wood, plastic, or metal ammunition box, declared to the airline, inside checked baggage — it may share the locked firearm case if packed that way — and magazines boxed or inside that same hard-sided case. Airline quantity limits still apply. If she instead walks to the checkpoint with the rifle accessible and the ammunition in a pocket, TSA's civil-penalty rule treats that combination as a loaded firearm even though the rifle was "unloaded" in the ordinary sense.

The TSO's public job is not to invent a new packing exception. It is to recognize ammunition, magazines, and parts as not carry-on items, keep them off the sterile area, and apply the published checked-baggage path when the traveler packed correctly.