Was the re-inforce lug on the rhs of the receiver of a no4 mk1 machined off in FTR?

[jmoore]

Are you referring to the lump on the RH forward side of the action body? (The one intented for the magazine cutoff bits.) The only No.4 actions of that sort I've seen are late No.4 Mk.2s and some possible post-production Mk.2 put togethers.