Nomenclature for missing screw Savage Stevens 77B

[TheDoctor]

Trying to reassemble a 77B for a friend. On the left side of the receiver, there are the 2 trigger group pins, and above them, a hole for a screw. The screw is missing. I can not figure out what it is from the schematic on Wideners. Does anyone know the name for it? Thanks.

[kenyerian]

https://www.gunpartscorp.com/Manufacturers/SavageStevensSpringfieldFox-33479/Shotguns-40503/77ShotgunSeries-41385/77B-34258.htm Here is a link to Numrich's schematic and parts list. Maybe this will help.

[44man]

Chances are that if a screw in the receiver is missing, there is a part inside gone too.

[KCSO]

That is the infamous UR that we gunsmiths always get. It is made from unobtanium and costs $5.00 plus 17.95 shipping and is currently out of stock.

[TheDoctor]

159720

Not the best pic, but you can see an empty hole. Checked out the schematic from gunpartscorp, can not figure out which part it is. Guess the brains not working right.

[mac60]

Is it #18 ejector screw?