Threatd size for 870 tapped reciever

[doubleott]

I got a Weaver multi slot base mount for my 870. Mine is not tapped, so I need the screw size to tap it. Screws came with the base.

I have done this before, but it was a long time ago...
Thanks for any help.

Tom

[Scorpion8]

Screws came with the base.

What size screws came with the base? Usually there is a chart that for such-and-such a screw, you drill with a #xx drill-bit and then tap for that certain screw. We can't help w/o knowing what screw size came with the scope base.

[Dreadi]

Screws came with the base.

What size screws came with the base? Usually there is a chart that for such-and-such a screw, you drill with a #xx drill-bit and then tap for that certain screw. We can't help w/o knowing what screw size came with the scope base.

2nd this!

[ChillyB]

If your rail was designed specifically for the 870 that came tapped from factory then yes, the screws that came with the rail SHOULD be correct for a factory hole pattern.

If the rail is a generic section then I'd not install it because I wouldn't want a non-standard hole size or pattern on my shotgun. It limits your options if you ever want to change mounts. Or you add even more holes.

I dont know the factory hole size or pattern yet but I'm installing a Scalarworks Sync low profile mount for Trijicon RMR that uses factory pattern. Had receiver previously been drilled for a generic rail, I may have encountered issues with hole overlap and "Swiss cheese" results.

[Banshee]

I got a Weaver multi slot base mount for my 870. Mine is not tapped, so I need the screw size to tap it. Screws came with the base.

I have done this before, but it was a long time ago...
Thanks for any help.

Tom

Weaver bases generally use 8-40 screws. Should measure 0.160-.0164 diameter

[doubleott]

Thank you...