The phrase "a holster of" is correct and usable in written English.
It can be used when referring to a holster that holds or carries something, typically a firearm or tool.
Example: "He reached for his sidearm, carefully placing it into a holster of leather."
Alternatives: "a holder for" or "a carrier of".
He tapped a holster on the right hip of his jean shorts; it held a.40-caliber pistol, which he said he was licensed to carry.
You could add a holster to your side of the Chicken Plate just in case, or even cut a hole in the chicken plate and mount a high capacity AEG (Like a cheap $30 P-90) for use as an "MG" so you can rain down fire on a location in two ways.
He pulled his cell phone out of a holster, called one of Hervé's competitors, who was unhelpful, and then briefly contemplated calling friends in Martinique for a consultation.
They included a.357 Magnum, a sawed-off.30 carbine, two black nylon caps, a holster, a can of Mace, a pair of Smith & Wesson handcuffs, two rolls of black electrical tape, a police badge, five AAA batteries, a police scanner, a glass cutter, gloves, and a fishing cap.
He pulls what appears to be a Taser out of a holster and shouts: "Get out of the car.
Sandford allegedly tried to pull a gun from the holster of a police officer at a Trump rally in Las Vegas on Saturday.
Video evidence released after the shooting showed Scott stepping out into the parking lot, but did not make clear whether he was holding a gun, which he had been carrying earlier in a holster around one of his ankles.
An emotionally disturbed man being escorted in handcuffs by the police on Monday ripped a gun from the holster of an officer outside Harlem Hospital Center and shot a second officer in his left foot, the authorities said.
"The buyer walked in, pulled a revolver out of a holster he was wearing, and placed it carefully on the table," Mr. Wagner said.
