A few years ago someone brought in to the Armourers shop at Warminster a rusted out Bren magazine found on one of the old parachute training areas. You could see live ammo in the top but as soon as they tapped the base on the bench, the mainspring asserted itself, ejected the base plate across the floor with a 'twwwwwwwangggggg' followed by the follower and rest of the live rounds - about 20 in all!

But no doubt, some others were absolute crap. Good engineering practice suggests to me that springs are best maintained in neutral
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