I have a remington 870 shot gun with original choke tube that has been in for 10-12 years. I have just got a carlson choke tube for coyotes and foxes and can get the old one out. Iv tried kroil but it wont budge. And advice?
+1 as above. If it dont work by spraying it in you may have to put some in a cup and put end of barrel down in to let it soak.
If that dont work take an actual choke tube wrench and stick in chok and give a couple soft taps on wrench with a hammer. Or try some heat from a heat gun.
Disclaimer: i am not an actual smith. Use info at own discretion. Also use extreme caution as the end of those barrels are pretty thin