While I believe most MBR's were designed to be routinely reloaded by replacing the empty with a full mag, as opposed to reloading with clips, the steel box magazines were (relatively) expensive and in limited supply.
The Canadian variation of the FN-FAL is, in my experience, much easier to change mags on than an M14; but it's stil a ways from "drop-free".
Doctrine with the FN-C1 involved removing the magazine in a controlled manner, and retaining it, before reloading, during fire-and-movement.
As a young soldier, many was the time when our section had to retrace the steps of an assault to find a dropped mag, while some sergeant gently reminded us that a lost magazine might make the difference between living and dying (and also how sorry he was that our mothers had given us syphilis, after having contracted it from the monkeys they were enjoying conjugal relations with, and other such expressions intended to uplift our spirits and encourge us).
The Canadian variation of the FN-FAL is, in my experience, much easier to change mags on than an M14; but it's stil a ways from "drop-free".
Doctrine with the FN-C1 involved removing the magazine in a controlled manner, and retaining it, before reloading, during fire-and-movement.
As a young soldier, many was the time when our section had to retrace the steps of an assault to find a dropped mag, while some sergeant gently reminded us that a lost magazine might make the difference between living and dying (and also how sorry he was that our mothers had given us syphilis, after having contracted it from the monkeys they were enjoying conjugal relations with, and other such expressions intended to uplift our spirits and encourge us).