Seahawks RFA Garry Gilliam has signed an offer sheet for a one-year deal with the 49ers, per a league source. Gilliam, 26, has started 29 games at right tackle for Seattle over the past two seasons. The Seahawks have five days to match the offer. Seattle offered Gilliam the lowest tender at $1.797 million, but that salary would not be guaranteed. If the Seahawks choose not to match San Francisco's offer, they will receive no compensation in return. The 49ers initially offered Gilliam a multi-year deal, which he turned down. A one-year contract would allow him to still hit free agency next offseason at the age of 27.