The Mississippi man stuffed the gun frame in the bottom of a boot and hid other parts of the weapon in a box of Legos stashed in his carry-on bag, the agency said in an Oct. 17 news release.

T-slot extrusion, a modular framing system consisting of aluminum profiles ... For large, load-bearing structures, bigger frames (e.g., 1.5 in. or 40 mm) in the manufacturer’s standard weight ...