This is a task that needs the services of a professional gun smith or the maker of the weapon.
Moderately interchangeable. That means you will need a gunsmith's shop to fit the heavier barrel to the rifle.
The barrel on a BSA Super Ten rifle is fit into place by screwing it into the receiver. It is tightened down until it fits snugly and then torqued to specifications to prevent movement.
A Marlin 39A Century barrel will not fit on a 39AS rifle due to design differences. Modifications would need to be performed by a gunsmith to make it work.
Unsure of what you are asking exactly. Micro-groove is a term used by Marlin to denote a type of rifling in its barrels. If you are asking if such a barrel can be tightened to the receiver (frame) of the rifle, the answer is maybe. Some are threaded, some are held by a cross pin, and some are a press fit (under great pressure). With any of the methods, you may change the headspace of the cartridge by changing barrel-to-receiver, and that CAN be a very dangerous condition. IF your barrel is loose, this should go to a gunsmith. Soon.
You will need a slide/ barrel bushing that will fit the barrel you want to install.
A PMI razzor barrel (spyder thread) will fit your barrel needs. You know it will fit if it is "spyder" threaded.
It has been awhile for me but I don't think you can remove it. The speedometer is a press fit and has to be pushed out from behind.
Barrels are to small to fit any one horse into it. So no horses can fit into a barrel.
The CVA Optima and the Optima pro are the same guns except for the barrel length (26" & 29"). Barrels are interchangable.The optima elite is a newer different gun and I Don't have experience with it.
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Yes, the 98 threaded Flatline Barrel will fit the Alpha black.
Several companies make a rifled barrel insert for a break-open shotgun- but they may fit one model and not another. Run a Google search for "45-70 barrel insert", and you should get several hits. EEA Corp is one company that offers rifle barrel inserts in different caliber for 20 g and 12 g shotguns.