If you have the body, that's the worst of it. The problem here could be the internals. Most of them will be the same but I think the lock frame will differ greatly. Barrel and extension should be spot on and cover group. The bolt should be the same but the sear I believe has been altered. Warren on here will have a grasp I should think...and because he's in Canadaicon too it might be worth messaging him and pick his brain. It's sometimes hard to get his attention because he's busy. Just keep trying...