Main screw busing correct name?

[Alan de Enfield]

In the 1945 issue of "Parts Identification List" it is designated "Collar" and under 'remarks' it says "for trigger guard screw"
The part number of this part for a No1 Mk3 is BB0676 and for a No4 is BB8579 so you could always just refer to it by part number.

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[fergs]

good old numrichs has it described for the no1 mk111 as part number 30 gaurd screw bushing i dont know how acurate they are but,
where as the schematics from ian skennertons book on 303s has it as part number 29 collar steel vocab number bb0676 made of steel and 1 of
regards
fergs