Hi,
The 17pdr or the 25pdr could be fitted into the turret of the LCG(M).
The LCG(M) Mk 1 were to be a mix of craft carrying either the 17pdr or 25pdr and the LCG(M) Mk 2 were to carry the 25pdr.
Photo FL 5990 on the IWM website shows LCG(M) 103 with the 25pdr fitted.
https://www.iwm.org.uk/collections/i...ject/205120518
Regards
Danny