Comments by "" (@neutronalchemist3241) on "Garand Thumb"
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@-Zevin- From the point of view of the infantry rifle, 6.5mm proponents were right.
You can see how, after more than a century of development, 6.5mm "tactical" ammo still gravitate around their energy level (6.5 Grendel is a little less hot than 6.5 Carcano. .264 USA / .264 LICC is a little hotter...).
BUT, among the 6.5 users, only the Italians made a MMG in 6.5, used it in WWI, and decided it was underpowered (it was not an impression. The 6.5 Carcano bullet has exceptional penetration on anything softer than lead, but very poor on anything harder). So they made the 8mm Breda cartridge exclusively for MMG use. Swede and Norwegians developed the 8X63 and 7.92X61 for the same reason, the Dutch adopted the 8mm Mauser for their MGs.
However, from a logistic standpoint, it's better to have a cartridge for infantry rifle and one for belt fed MGs than two for infantry rifles (.30 carbine, 8mm Kurz...)
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Many range competition firearms have an electric trigger for that reason. It's the finest imaginable.
But on a field weapon it has problem with batteries, sealing, EMP...
For a bullpup to have a more than decent trigger only needs to transfer not the movement of the trigger to a sear that's behind the magazine, but to keep the sear above the trigger, and only transfer the movement of the hammer behind the magazine (so, not a long trigger group, but a long hammer group). Ammo don't care if the movement of the hammer that hits them is creepy, or mushy.
The Kel-Tec RDB is the first bullpup made that way, and the comment is that, out of the box, it has a trigger that's "marginally better than a stock 'milspec' AR-15 trigger". So, good for adoption.
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