OK, not strictly an L1A1 question but...

[nzl1a1collector]

Basically I've done what tankhunter said except I have a machinist mate who kindly threaded the hole on the left hand side of the bracket, bipod. I used the long handguard screw for the L1A1 wood handguards to secure it all.

You need the following:-

L2A1 Bipod (1005-99-964-1258)
Adaptor, Bipod (1005-13-010-0631) (if this type isn't fitted, it has straight sides and needs to be modified)
Screw, Handguard (1005-99-960-2101) Long L1A1 Wood Handguard Screw

[Peter Laidler]

If you don't drill-out the thread in the right handguard, you won't be able to tighten up the bipod onto the handguard because the screw will only tighten into the handguard and not the bipod bracket.

Do you iknow the EMER number KtK? I've seen the ITDU papers but not the EMER drawings and authority

[skiprat]

Only one part would require to be threaded, either the handguard OR the bipod head.
If just the handguard was threaded there would be a bit more articulation of the head (loose, hanging from the handguard screw) but the handguards would not be beyond repair.

To thread the bipod would require a tap that was not always held at unit level, If you were to leave the handguard threaded and plain drill the head, this modification could be done by any Armourer with a supplementary tool box (hand drill and hacksaw)

[Peter Laidler]

I'm not sure now but I THINK that the handguard screw thread was a 5mm metric thread. I always believed that the L1A1 was an anglicised FN-FAL until we got our hands on the Argentinian FAL's. (and FN MAG/L7's too). Then I realised that apart from some changes in design, where the design hadn't changed, most parts interchanged especially threads.

[Longshaor]

Thanks for the info, guys!