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A picture of the Egyptian Hakim rifle, one with a modified MG13 magazine inserted. Shown beside it is the bayonet, as well as the original 8rd magazine the gun is designed with, and which was supposed to be left in the gun at most times, being filled up with clips or loose rounds (it being detachable was more for a convenience of maintenance and cleaning, you weren't issued a bunch of loaded magazines for these guns).
The Hakim is a licensed variant of the Swedish Ljungman Automatgevär m/42, itself chambered in the Swedish 6.5x55mm Mauser (of course), the Hakim being designed for the 7.92x57mm Mauser cartridge they were using. It uses a tilting breechblock, and operates on direct-impingement, where there's a tube tapping off gas from the bore via the gasblock, which then just plain shoves the bolt-carrier assembly backwards, a little bit like a short-stroke piston if you just eliminated the piston and let the gas shove on the carrier directly instead. Contrary to much belief, this is the only kind of action which described direct-impingement, though the later AR10 and AR15 uses a similar gas tube, the actual function is quite different and much more controlled.
You kinda get gas spraying a little all over the place with each shot, thus gradually building up carbon on the gun and on yourself, so after a day of shooting you will look like a coal miner. Being able to take the magazine off with not too much difficulty is definitely a nice feature for a gun that gets itself pretty dirty like this one does.