Use a bit of caution on choke selection....... My 101 Diamond Grade Unsingle has the "Win-choke" system and is interchangeable with the Browning Invector but NOT THE INVECTOR PLUS. There is not a lot of information available on the Diamond Grade but I believe mine is mid 70's manufacture and I am only assuming the chokes were a factory installation...... Larry
I had a Win 101 Diamond Grade Trap that was fitted for factory chokes (Winchokes) only on the bottom barrel. Top barrel was fixed Full choke. The Winchokes (since there are a couple different styles) were the ones that stuck out about 1/4" from the barrel face; when installed it was then flush with the top fixed barrel. I found that Browning Invector (not Plus) chokes fit fine. However, they were flush chokes so it looked a little goofy when I had one installed; like the bottom barrel was shorter than the top barrel.