Answer the glenfield by marlin is compatible with marlin 120 12ga barrels are available for the 120 the only difference is the stocks wich are also interchangable the 120 is higher quality I love my glenfield That model is obsolete and you are not going to find a slug barrel. If you must use slugs, you can have the existing barrel modified to accept interchangeable choke tubes and use a rifled tube when shooting slugs.
Perfect for deer hunters wanting rifle-like performance in an affordable, yet dependable, shotgun package, the Model 870 Express Slug Gun utilizes fully rifled, heavy contour barrels to deliver devastating knockdown power with optimal accuracy. Available in both a 12-gauge and 20-gauge version, the added weight of the heavier slug barrel helps reduce the recoil of magnum slug loads while our cantilever system provides a solid scope mount platform that won't lose its zero like other mounts. These pump-action shotguns feature a non-glare matte finish on all exterior metalwork and all-weather black synthetic stocks and fore-ends.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.