Guys, I have a Boyes I too got it for my Mk1 carrier.
It has been converted to .50 cal browning
Here in the U.S. no paperwork for a .50 Vs the .55cal and
.50 cal blanks are very easy to get so when I go to WWII reenacments I can shoot a the Jerrys.
A dealer here in Pennsylvania Just sold a Boyes monopod and round muzzle brake for $5,500 USD last week. I payed $4,600 for mine last year they are getting up there But with that boyes sticking out of the carrier it look like a wee tank very cool.
Steve K
CT113354