You need to be specific with your shotgun models, what gauge is your shotgun and if your need is 2 3/4 or 3".. They are not all the same and some have rifled sights some have scope mounting provision.
Yes, they are different- but i have both a 2 3/4" and a 3" 1100 Remington auto- and i have both a 2 3/4" and a 3" Browning A5 auto- so i can make almost anything work. I also have scopes so the sights are not that important, just looking for a muzzle brake barrel (just had surgery, Dr says no more bad recoil).
Yes, 12 gauge would be great, but i also have 20 gauges if needed. Hastings is out of buisness right now, but another company is attempting to re-start the manufacturing of the barrels. I can make almost anything work- i can also still find a couple new ones online, but i was hoping to find a good used one.( wallet is a little thin since being off work for neck surgery!!) lol
Understand... damn things new are near the price of a pretty nice gun! Used is your best bet since they are normally not gonna be abused.. They are nice!! I will keep half an eye out for ya.. keep looking & good luck!! :)