Custom Piece Miniature – SIG Sauer MCX modern assault rifle – 3D Print for LEGO minifigure

This is a toy rifle accessory designed to be compatible with LEGO minifigures. It appears to be a miniature replica of a modern assault rifle.

The specific firearm it represents is a SIG Sauer MCX. This is suggested by its overall design, including the short barrel, handguard with a Picatinny rail, stock, and the presence of optics (a red dot sight and a magnifier).