The 4.2 mortar and the .50 cal HMG are too large. The 81mm mortar is too small. I knew this going in with this purchase, and got this set because of the other excellent weapons and poses. I plan to strip some of the gunners to populate Plastic Soldiers 6 pdr AT gun set, and use the British guns (the kit comes with a US Army alternate 57mm gun barrel) to form an AT platoon