That bump stock thing is a total diversion.
The FBI-Las Vegas police feud was discussed at the 4chan thread, which was soon closed down for new comments:
According to a source in the Las Vegas Metropolitan Police Department:: “The LVMPD knows the motive behind the attack, but the FBI will not allow us to release the motive because it implicates the FBI in illegal arms deals and supplying arms to ISIS terrorists within U.S. borders. Stephen Paddock was an undercover FBI agent who participated in multiple illegal arms deals in the Las Vegas area in a gun-running entrapment scheme similar to Fast and Furious. Paddock thought he was engaging in another routine arms transfer, but ISIS had learned about the entrapment scheme and Paddock’s true identity. They killed him and carried out the massacre, and then fled the scene.
“Everything is being kept under extreme wraps because 1) armed ISIS terrorists are still at large and 2) this is very embarrassing to the FBI and they don’t want their scheme to become public knowledge. . . . People within LVMP are disgusted and are pushing for this information to be released to the public.”
ISIS Gunmen In Vegas Executed US Defense Spy Paddock
It wouldn't be the first time the FBI has created terrorism