This one-of-a-kind hero prop built by me is based upon an original British Enfield MK3, which is the exact gun used in the original 1977 movie by the prop department.  I purchased a damaged rifle, cut down the barrel and stock (this is legal to do).  I think welded the bolt so that it is inoperable.  Then I obtained the grenade cup and welded it on as well.  I left the attachment hooks in place as I felt it was a good look.  Magazine is still detachable.  Please note: because this receiver is still intact and not torch-cut, it is considered a firearm by BATF and must be sold to a dealer or someone with a C&R License.