Free: Contests & Raffles.
I made one for a friend that is 'small of stature'. Bought an aftermarket stock and cut 4" off of it. That way I had the original I could put back on. The gun itself was a 26" barreled (same length as a 'youth' model) standard length gun. I did another that I cut off the stock but saved the piece and put it back on with a 'filler piece' added for the saw blade width. Yes, it had a 'ring' around the stock. Doweled it for extra strength. They were happy as it was the same gun they had been using for years.
Easy enough, if I had to chose between one or the other, 870 all the way. (Is it because that’s what many of us cut our teeth on, so we instantly think that)
Had a Supernova. Played with it one day with different brands, shot sizes and lengths of ammo all loaded together. Never jammed. Never failed to cycle. Never failed to fire.