It's hard to mess up a choke tube... Personally, I stick with OEM, which means Remington. My Ithaca was shortened to about 20", but had it threaded for Remington chokes for compatibility with my hunting shotguns, which I have pretty much most of the common sizes. My KSG uses a SMT Tactical choke adapter... which also uses Remington chokes. Was considering having my IAC 97 and Century PW87 threaded for them... but think I'm going to wait until I get other things squared away (would like to refinish them, as well). The only shotgun that uses different chokes is my Mossberg SRII, which is my trap gun. Run full and improved modified in it. Think they are Beretta/Benelli chokes. Stock ones were extended, so easy to tighten down. No desire to pick up more. And I agree... clean and grease them before installing. Saves a lot of headache. If you buy tubes online, get a tube with them.