This off-season the Raiders got serious about upgrading their offensive line. One of the moves they made was to draft offensive guard, Gabe Jackson. Now heading into the team's third OTA, the 6-4, 336-pound rookie was receiving some reps with the first team offense, according to Vic Tafur of the San Francisco Chronicle.

Practice over. Rookie Gabe Jackson got some work in with first team at left guard. #Raiders — Vic Tafur (@VicTafur) June 9, 2014

Up to this point, it has been Khalif Barnes primarily getting the reps at left guard. He is a the incumbent starter at the position. Barnes started the final five games of last season at left guard, replacing the ineffective Lucas Nix. Barnes was a considerable upgrade at the spot and was re-signed to his sixth-straight one-year deal this off-season to return to the team.

Gabe Jackson was the team's third round draft choice and is seen as a potential day one starter. It is still OTA's and the Raiders are going to be trying out different personnel groupings. It helps in the evaluation process to see Jackson face off against the Raiders first team defense, even if it is a non-contact situation.

We'll see if he continues to get reps with the first team when the Raiders enter their mandatory minicamp next week.

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