The gunmen who allegedly opened fire on Young Dolph, striking and killing the rapper at a Memphis cookie shop were brazen in their attack ... as shown in new images from the murder.

TMZ has obtained surveillance stills from Wednesday's shooting showing two men, with almost their entire bodies covered -- grey sweatpants, jackets, hat/hood and masks -- gunning Dolph down. One man appears to have a pistol and the other a Draco AK-47 pistol.

Cops were quick to the scene, blocking it off, but an employee at the cookie shop tells us the men immediately sped away in what is believed to be a lighter colored Mercedes after opening fire.

About an hour after Dolph's murder, more patrol cars and officers with weapons out stood guard outside Prive, a nearby restaurant owned by Yo Gotti. While Gotti has yet to be tied to the murder in any way, he and Dolph have beef that stems back several years.

Law enforcement sources told us employees at Prive called, concerned there may be some sort of retaliation against Gotti for Dolph's killing.

As of this post, police have still not named the suspects or made any arrests in connection to Dolph's murder.

Dolph's attorney and friend, Scott Hall, tells us the rapper was supposed to attend a charity turkey giveaway later in the day on Wednesday.

He was just 36.