The thing normally found on the muzzle is a booster. Without it they are basically single shots. Increases blow-back to operate the mechanism. However the top photo is curious. They did issue trench armour plating, including a disc for the front of the gun, however that looks like a coffee can.
That first one is on a sled mount, a very versatile and adjustable mount. Also very heavy, and moving one around was the job for the big guy in the platoon.
The mounts in the last photo are interesting. They look like the wheel mounts that the Russians used in WW2, but on legs.
I'm an old Maxim gun enthusiast so these photos are fun. Dolf Goldsmith's "The Devils Paintbrush" is a great book on the subject. I'll have to get mine out and freshen up a bit.
dju
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