Protective gear and travel accessories
Body armor and attached equipment
At a US checkpoint, TSA generally allows body armor in carry-on and checked baggage. Empty its pockets and check each attached item separately. A blade, firearm part or spray does not gain permission because it is fixed to a vest. Measure the complete package against your airline's baggage allowance, and keep plates from shifting inside the bag.
An empty holster is a separate item
TSA lists an empty holster for both bags. A firearm, magazine or ammunition inside it has separate conditions; use the firearms and ammunition guide for those items. Open the holster's compartments before packing so nothing is left behind. The TSA item list gives the US screening entries for holsters and body armor.
Handcuffs, keys and other tools
Ordinary handcuffs are allowed in carry-on and checked bags at US checkpoints. Keep their key with them, and check any added blade, spray or lock-picking tool under its own rule. Lock picks belong with hand and power tools, where length affects carry-on screening. Airport permission does not settle local possession law; check that separately for your destination and return trip.