Try Mid West Gun Works.
I am a gun dealer in Asheboro, NC (Franks gun and pawn). Yes, the Baikal choke tubes will fit. This gun is made by Baikal for Remington. It used to be imported under the EAA name. You can also get tubes at Colonial choke tubes.
To determine different shot patterns
100-1000 or more depending on specifics
Try gun shops, gun shows, want ads, e-gunparts.com
Zabala and Zastava.
Choke tubes are round case-like devices that tighten the pattern of BBs as they leave the barrel of a gun. The tighter the pattern, the better its long-distance accuracy will be.
Browning made choke tubes.
100-500
Modified describes a choke. Invector is a system of choke tubes.
ur gun was made after 1986,may wanna try old western scrounger on the net
You don't give us the model, so it is hard to answer the question. Assuming the gun does not have an obvious adjustable choke, the choke is probably not easily adjustable. A gunsmith can open the choke (from Full to Modified for example) or can install internal interchangeable choke tubes (costs around $125).
Tubes that constrict the column of shotgun pellets as they exit the barrel