870 Receiver Hole Threads

[C77]

posted this in Gunsmithing too, sorry for duplicating, but I thought you guys might know better.

I have a rem 870 Tactical Magnum with the four factory tapped holes on top. One of the hole's threads are messed up and I want to chase it.

Does anybody know the size/thread?

Thanks!

 

[sherlockbonez]

What does "chase it" mean?

 

[Ftaview]

run the same tap through the same hole, to make the threads good again

sorry I don't know the size of the tap

 

[ARWEN ACE]

They are #6 - 48tpi

 

[C77]

Awesome - thanks!