Redneck or whomever

I have never done this before - M70 XTR featherweight - instructions straightforward EXCEPT:

On factory fp there is a flat, that a screw on left side of shroud protrudes into. Firing pin retainer into shroud, looks like. Win FP inserts into shroud from back, Tubb goes in from front, will not slide into or out back

Is this screw needed on Tubb system? If not, what do I do with it - shorten it so it sets flush, set it with Locktite protruding? le

Do I need to file a flat on the Tubb fp to mimic factory? (haven't answered back yet). Step 8 Tubb instructions?

[Linked Image from i.imgur.com]


Last edited by las; 07/17/20.
The only true cost of having a dog is its death.