Ejection port? That is on the left as well; hence you could probably slide a right-hand bolt in the left-hand model, but wouldn't be able to insert the bolt puller and might have a few problems with spent shell ejection. However, if you change the barrel, the stock, then the bolt, then yes, in theory you could change the left-hand to a right-hand. Just curious, do the shims in the SBE allow adjustment for left-hand cast?