Is this a Mk5 bolt

[Surpmil]

The long slot in the long recoil lug is standard to all No4 and No5 rifles and originates in the No1 MkVI if I remember correctly.

As for the bolt knob hole, some No5s had a considerably larger hole than the No4s, and the knob was also shortened somewhat. The hole sizes were about 3/8" versus 1/2" as I recall.

I doubt the hole was ever used for work-holding during manufacture, if only because plenty of other bolts (No1 No4) were made with no hole at all)

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.

[Alan de Enfield]

I doubt the hole was ever used for work-holding during manufacture, if only because plenty of other bolts (No1 No4) were made with no hole at all)

When I mentioned that, it was as a result of coming across an old PL post where he states that one (No4) manufacturer requested a deviation to the original specification (no-hole) to allow ease of 'jigging-up'.