Joe, a blind hole is always harder to do. Also the reason why modern guns don't use through lumps is because of advancements in machines. The sinker edm made it viable.
Sure, one get get sloppy fitting a non through lump since it wasn't visible. But when done properly it will bear on the same surfaces as a through lump and provide the same strength mentioned above by others.
Another reason for through lumps is in the ability to lighten and reduce the size of the action bar and forend. Like mentiened this isn't always the case, just a broad generalization.
I'll continue to stick by that thought.
Last edited by gunmaker; 07/31/14 10:02 AM.
