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SMLE (Rifles No1 & 2); SMLE (Mk3 & 3*) foresight blades are all solid base (dovetail). In form they are similar to No4 Mk1 blades, although generally the platform that the blade sits on is wider and consequently the dovetail part looks flatter and smaller although it is not. There are 8 sizes of SMLE blades listed, running from -0.060" to +0.045". Some references also list 2 further sizes +0.060” and +0.075” although so far I have not found a reference to British Army Part Numbers for these. The '0' sized blade is a zero on both SMLE & No4 & No5 foresight blades because the sizes are taken from an imaginary line 1" above the centre of the bore, therefore on '0' blades the tip of the foresight is 1" above the centre of the bore, the +0.015" is 15 thou above the line, the - 0.030" is 30 thou below the line etc. So, SMLE blades should be physically interchangeable with No4 blades, other than the size ranges are different.
(source: https://www.ds-solutions.co.uk/index.php?route=information/information&information_id=19)
