Gunman Shane Tamura used Palmetto State Armory AR-15 in massacre at Midtown skyscraper

Smears of blood were seen on the assault rifle Shane Tamura used during his deadly rampage inside 345 Park Avenue on Monday night, according to a photo obtained by The Post.

The rifle is a Palmetto State Armory AR-15 assault rifle in .223-caliber.

The gun used in the massacre was seen smeared with blood. Obtained by the NY Post

Shane Tamura was ID’d as the gunman in the bloody assault at a Park Ave. Building Obtained by the NY Post

Gun retails for about $420.

The 27-year-old from Las Vegas killed an NYPD cop and at least four others, and injured several others.