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Polish "Lantan" modular rifle, chambered in 7x41mm 'Marszyt' round, It was the result of The Polish Military Technical Academy project to introduce an intermediate cartridge that was better than 7.62x39mm.As mentioned 'modular' said rifle was also supposed to come with ;one receiver, multiple length barrels; configuration to turn it into service rifle, carbine, LMG etc out of single weapon by change of barrel and so.
likewise many other projects this too got shelved once Warsaw Pact
supremo the USSR decided against it and thrusted their Kalashnikov upon the Poles instead
though they still kept innovating on basic Kalashnikov design and introduced an AK named Wz.80 which came with fire selector and 3-round burst mode along with usual semi-auto and full-auto on AK
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of course it wasn't adopted as the Warsaw Pact had already moved on to 5.45x39mm by then, and they decided to make their own 5.45mm AK instead of adopting vanilla ruskie AK-74, for that project they based their AK on this Wz.80 and end result was, of course, Wz.88 Tantal
on side they seemed to have experimented with bringing old Lanten to life by making a 5.45x39mm version as evident from this pic,
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but eventually they went ahead with AK only
as for 7x41mm itself,
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5.45x39mm, 7.62x39mm, 7x41mm 'Marszyt'
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250 grains (16.2 grams) total weight, ~118 grains (7.68 grams) bullet weight
Case length 41.41mm
Bullet diameter 7.21mm
Head diameter 11.30mm
The bullet had a trajectory peaking only 240 mm high at 300 m, leaving muzzle at 770 mps (2530 fps) – which given a 7.68 g (118 gr) mild steel-cored ball weight would give the muzzle energy in the 2200 Joule region