McQ is a heck of a player. He'll do fine.
Earlier this year in a game, Colombo's shoe came off and he couldn't get it back on before the next play and McQ ran out there and took a snap. He stonewalled some guy on the play and the offense never missed a beat.
Now, I know that's different from playing a whole game... but I think Red will do just fine.
Personally, I think if Colombo hadn't been hurt most of training camp, forcing McQ to play in his place... that McQ would have competed against Kosier at LG like they wanted to do and that he would now be our starting LG.
That may indeed happen next year if Martin and Free play well enough at T.
$0.02