British Enfield #4 mk 1

None. Some rifles just don't take to aftermarket scope mounting. At least that Bad Ace one doesn't require removing the rear site. And no damaging the rifle if yours is still in full military configuration.
Before you spend any money on any Lee-Enfield, check the head space and slug the barrel. (that'd be hammering a cast .30 cal bullet or suitably sized lead fishing sinker through the barrel with a 1/4" brass rod and a plastic mallet, preferably from the chamber end, and measuring it with a micrometer. Easier to do than type out.)
Thousands of 'em have been assembled out of parts bins with no QC. Enfield barrels can measure from .311" to .315" and be considered OK. The issue is the bullet diameters used by American ammo and bullet makers. Some are .311". Some are .312". Montana Bullets makes cast .313 and .314 inch bullets. 180's and 200's.
 
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