The British called it a "piling swivel". Same thing.
FWIW, only a few real M1 rifles were used in BoB. Most were plastic dummies, but some had holes in the top so the actors could be seen inserting dummy plastic clips. A year or so ago, the NRA museum had a display of those "rifles" and "ammo". They were cleverly made, but even in the movie an experienced eye could see that the guns were fakes.
Jim
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