Custom Piece Miniature – AR 15 platform firearm assault rifle or carbine – 3D Print for LEGO minifigure

This item is a Lego minifigure accessory, specifically a toy weapon designed to be held by Lego figures.

Based on the image, the object is a tactical rifle or carbine.

Key features visible are:

• A Picatinny-style rail along the top of the receiver and handguard.
• A distinct pistol grip.
• A curved magazine, suggesting it’s meant to represent a rifle rather than a shotgun.
• An adjustable or collapsible-style stock.
• Iron sights (front and rear).
• A muzzle device, possibly a flash hider or muzzle brake.

While the image metadata suggests “mka 1919 pump action,” this Lego accessory more closely resembles a modern assault rifle or carbine in style, similar to an AR-15 platform firearm, rather than a pump-action shotgun. The MKA 1919 is a real-world shotgun that shares some visual characteristics with AR-style rifles (like the magazine feed and pistol grip), which might be the source of that description. However, for a Lego accessory, it would be generically referred to as a tactical rifle or assault rifle. There isn’t a specific official “Lego model name” for this item in the way Lego names its sets; third-party custom Lego accessory makers often produce such items and might give them their own product codes or descriptive names.

In summary, it is a Lego minifigure accessory representing a modern tactical rifle.