removing the breech plug
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Depending on the maker you can remove the breech plug and of course the sights and underlug. It is not an easy task to remove the plug and without proper tools usually results in a buggered up barrel or plug. You would need a barrel vise and a breech plug wrench, some heat and penetrating oil. I would recommend taking it to a gunsmith in your area.
Impossible to answer via the internet. Take it to a gunsmith.
Nope. You can try welding it in (I heard of a few who tried that) but it becomes more difficult to clean. H&R changed the design just because of that reason. The new model has threaded breech.
out of breech and legging
Robert Breech's birth name is Breech, Robert M..
Jim Breech's birth name is James Thomas Breech.
Weapon loads at the breech vs. the muzzle.
Breech Academy ended in 1988.
Breech Academy was created in 1969.
Jim Breech is 5' 6".