The Remington 870 is the most popular pump-action shotgun ever made. I have two with different replaceable barrel lengths. I've had them both since I was many years younger. They will go to the grave with me.
The (Russian: МЦ is a shotgun fed by a internal revolving cylinder. It is produced by the TsKIB SOO Central Design and Research Bureau of Sporting and Hunting Arms. The Russian-made guns are available in 32 and gauge.