Way back when I bought a pair of British Automated Infantry from the Clockwork Goblin sub stand at Salute.
For various reasons I have not got round to build them.
A thread on the Lead Adventures forum was discussing weapon choices for the Automated Infantry.
Here are some comparisons:
First, here are the components (the components of the current Warlord Games version may differ).
In the depths of my spare sprue drawer I found an Italeri 1/35 modern weapon sprue with an M2 HMG.
Now, a quick measure shows the M2 is about 35mm long, which at 1/56 is 1960mm
Now Wikipedia says the length is 1654mm, which gives a calculated scale ~1/47, so it is probably 1/48.
The Vickers is about 25mm, Wikipedia gives a length of 1120mm, which makes it about 1/45.