The Bren simply Hangs on that 'Hook' as you call it. Belive it or not, gravity pulls it down as well as the firer pulling the gun into his shoulder in usage in the A role. The gun hangs from the underside front mounting pin, simple as that! So yes, it is 'Open' at the top ie: half moon if you like.
---------- Post added at 04:57 AM ---------- Previous post was at 04:53 AM ----------
Pete, the trend has been for a few years now that the lads would obtain 'Leatherman Tools' at thier own expense. A Very good multi-tool with a pliers facility as well. They are usefull in the field for bodge jobs to get you out of trouble. But nothing as good a a correct tool for the job at hand. I suspect also, that a lot of the guys bought them, but they hung on the waistbelt in thier pouches. Looking 'War-ey' (Ally if your Airborne!) & saw little use!........Certainly did away with can openers, other knives, screwdrivers, spanners, etc, etc. In my opinion, usage of this tool indiscriminately would result in damage to most fixings & fasteners!