IRVINE, Calif. -- The Los Angeles Rams, less than a week away from their first preseason game, are experimenting with the makeup of their offensive line. Rob Havenstein has spent almost the entire year transitioning to right guard, with Jamon Brown seemingly locking down the job as the starting right tackle near the end of the offseason program. But Havenstein and Brown switched positions during a light practice from UC Irvine on Sunday, each of them returning to the spots they played most frequently in the NFL.

Rams coach Sean McVay said he and the coaches have been talking about toying with a switch for the past week or so and wanted to wait until after Saturday's joint practice with the Los Angeles Chargers to implement it.

They'll test it out for another day or two, with no promises thereafter.

"We’re just trying to figure out the right combination in terms of how we want to do things," McVay said. "I think we feel really good about what Jamon and Rob have done in that right side, but with Rob’s history playing tackle and Jamon’s history playing guard, [we] also want to have contingency plans in place if one of them were to go down."

Brown, listed at 6-foot-4 and 330 pounds, played both tackle positions at Louisville, but was used mostly as a guard by former coach Jeff Fisher in his first two years in the NFL. Havenstein, 6-foot-8 and 328 pounds, was a right tackle at Wisconsin and in his first two years in the NFL, performing a lot better as a rookie than he did as a second-year player.

Havenstein's move to guard was initially made at least in part to accommodate Greg Robinson, who was moving from left tackle to right tackle after the acquisition of Andrew Whitworth. Robinson was ultimately dealt to the Lions for a 2018 sixth-round pick, but Havenstein remained at right guard and Brown continued to get first-team snaps at right tackle -- until Sunday.

"We’re just continuing to find whatever that best mix is for our five guys up front," McVay said. "Really, with the exception of [left guard Rodger Saffold], [center John Sullivan] and Whitworth, [the left tackle], all those guys are kind of moving around as we continue to find the best way to get those five coordinating up front.”