IC choke

[mossybird]

I got a slight problem fellas. My Mossberg 535 is threaded for Winchoke-Invector. I bought a IC 660. When I try to screw it in, it always gets super  tight. So I unscrewed it and cleaned it throughly. It still is sooo hard to screw in. Can you tell me whats wrong?

[SumToy]

Look at the choke to see if the thread part looks like the stock choke.  I have saw this with the browning more then other guns. Just had a guy call with two brownings. Choke fit one but not other one.  So if stock choke looks the same and it will work call them they will make it good.

[Turkey Trot]

Other than what the SumToy man said, you can try some grease on the threads to make it easier to work.