This is an excellent example (1 of 2) of a transferable fully automatic M2 "Ma-Deuce" light weight 50 cal Browning Machine Gun manufactured by the RAMO company of Nashville, Tennessee. These guns have been modified with aircraft upgrades that lighten the guns as well as increase the cyclic rate. The were part of a private collection and were mounted in a twin navy mount that has been sold. Now the guns are available for sale.
Gun does come with the air cooled shrouds to convert to the M2HB and the buyer would just need to get the M2HB barrels to convert. The assumption is that the guns were never converted internally for the higher rate of fire.
This is 1 of 2 that are available for sale. If the pair is bought together, a discount will be applied. Both guns are currently on a F3 and in the span and control of Mockingbird Precision.
https://www.mockingbirdprecision.com/index.php?main_page=product_info&cPath=61_18&products_id=715&zenid=8cear3o7ft09ur0coe71gp45d5