Simpson and co-defendant Clarence "C.J." Stewart are accused of trying to steal collectibles at gunpoint from memorabilia dealers at the Palace Station hotel and casino a little over a year ago.
In the McClinton recording, Simpson says to McClinton: "You didn't pull the piece out in the hall."
McClinton, a former co-defendant who accepted a plea deal, responds: "No, no, no, no, no, no, hell, no."
Simpson denies seeing any guns. In testimony, McClinton said Simpson had chided him, saying "that I had heavy hands."
"He was telling me there was no guns. I knew differently because I had a gun," McClinton added.
McClinton testified that Simpson had asked him to bring a gun and to "look menacing."
He said that he had his gun drawn when he crossed into the hotel room and that Simpson was close enough that their shoulders could have touched.
But by the time they were back in the car, McClinton testified, "He (Simpson) was talking about the fact that there were no guns."
McClinton was to face cross-examination Monday before the prosecution rests its case.
Jurors also heard recordings Friday of police investigators chuckling over Simpson's troubles, referring to him with foul language and rejoicing at his impending arrest.
"You're just picking on him because you're mad about the verdict," said Lt. Clint Nichols, head of the police robbery division.
"Yup," responded crime scene analyst Michael Perkins.
In another exchange, Nichols said, "He's going to get arrested."
"Who, who's gonna get arrested?" the analyst replied.
"O.J.," Nichols said.
"Oh, good," Perkins said.
The voices were captured on a digital recorder left running in the room by Thomas Riccio, the middleman who arranged the foray to reclaim Simpson memorabilia.
Defense attorney Gabriel Grasso showed jurors transcripts of the comments during testimony by Andy Caldwell, the lead detective on the case.
