Right guard Chris Kuper broke his forearm during a drill at Tuesday’s practice. Mike Klis of the Denver Post reports that Kuper will miss six weeks while he recuperates, a time frame that would keep him out of the first three regular season games. The blow is extra painful because Kuper had just made a comeback from a serious leg injury. Kuper suffered a nasty left ankle dislocation and broke his left leg in the final week of the 2011 regular season and missed OTAs and minicamp as a result of that injury. Now he’s got another injury to deal with and the Broncos have to replace one of their better offensive linemen on the fly.