I seem to recall reading in the trials papers that the 'new' 50's pattern small ring 'No7 type' bayonet was going to be a universal issue for the EM series AND No4 rifle. That's why they made it structurally different/stronger internally. This was because the original No7 had already been codified as belonging to the Mk5 Sten Gun family - hence the B3 VAOS prefix. The fact that it FITTED the rifle was coincidence or bye the bye really. It was a STEN gun bayonet and the new small ring was going to be the universal rifle bayonet.

Indeed, the new-at-the-time SMG, the Sterling/L2 was using the old trusty reliable and well tried and tested No5 bayonet and on acceptance of the new EM rifle there'd be a new rifle bayonet across the board and the crap old style No7 bayonet would die a natural death with the Mk5 Sten gun.

I thought that this was all common knowledge - yes? No?
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