[Shooter 2.5]

What would be the purpose? Just mount a scope and you're good.

If you're trying for an extention of the true barrel, you would have to line up the rifling absolutely perfect or things would get very messy.

If you're thinking about a longer sight radius, blooper tubes have been used to extend the iron sight radius in competitions. The trouble starts when the harmonics start to change and the groups open up.

[jwh_Denver]

What would be the purpose? Just mount a scope and you're good.

I'm no expert for sure on ballistics or warfare. I do know that ballistics have been known for decades and decades. If you want a gun that will do such and such it can be made with no problem. But no gun will be great in every situation. Take the .223, with a scope it will extend the users accuracy but not extend the bullets accurate range. The longer barrel would. (Correct me if I'm wrong).

My thinking was that the extension would be exactly lined up rifling wise when put on with marks on both pieces to insure that. Or some other way I haven't a clue about.