Fitting a new lower fore stock to a no4....what a job!

[Peter Laidler]

The front trigger guard screw is BSF I seem to remember and NOT 2BA as you suggest

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[Alan de Enfield]

The front trigger guard screw is BSF I seem to remember and NOT 2BA as you suggest

Screw, guard trigger front 1/4" BSF (26tpi)

[ssj]

The bolt is about 6mm or 1/4inch so a 0BA or yes a BSF....

0BA = 25.38TPI, 6mm OD
1/4 BSF = 26 TPI, 6.35mm OD,

Bugger of a job determining the difference in TPI on about 1/2inch of thread, so a caliper on the OD on it should tell us easier.

I'll measure it when I get home.

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edit - 6.32~6.34mm so BSF
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For reference,

British Tools & Fasteners - BA Thread Profile

British Tools Fasteners - BSF Thread Profile