QUOTE(shep854 @ Fri 29 Aug 2008 1251)

Detachable or charger-fed through the receiver? While a topped-up fixed mag would provide a degree of sustained firepower, it would be compromised by the time required to reload from the top. Still, 20 or so rounds on tap would be a comfort.
Either way, any guesses on how well it worked?
OT, but weren't some M1 Garands modified (field or armory) to use BAR mags?
Yes, as development pieces. IIRC they eventually turned into the T25.
I think some were privately modified as well, many wierd and wonderful things were done in the 1950s.
Back to the Trench Rifle, I do not think the magazines were detachable, they just took the floorplate off and clipped the extended magazine in. The rifle in Doug's color photo is a Mauser Gew.98a, the long WW1 rifle, not the later Kar.98.