You don't mention what sort of rifle this is, I'm assuming a M305.
Wasn't aware that these were made in two pieces, welded together.
If it is crooked, I would suspect that it is not bent, rather that the rear bearing surface with the locating splines was broached out of line with the axis of the unit.
If you are going to try to bend it, I would suggest that you consider the barrel - you would not want to bend it, and it is not particularly thick toward the muzzle.
Is the flashider removable? Replacement could be an option.
If it were mine, and I satisfied myself that there was an alignment problem, I would just bore the slotted front end so that it is true - coaxially aligned - with the bore of the barrel.