Ne semble pas correspondre à ma recherche (Villar Perosa):
"The guns themselves used delayed blowback action, in which the delay of the initial opening of the bolt was achieved by rotation of the bolt through the bolt handle that slid against the inclined part of the cocking handle slot. The bolt rotation, combined with separate firing pin, provided safety measure against premature ignition of the cartridge, as the firing pin was able to go forward and strike the primer only when bolt was in battery and completely rotated."
Ce que je recherche c'est bien , strictement une culasse percutante, et strictement blowback....
Comme la Sten si vous voulez !
Ce que j'ai trouvé de plus ancien, brevet et prototypes à l'appui, remonte à fin 1901....(et ce n'est pas du Browning)
Merci pour vos aides....
Non nobis Domine, non nobis, sed Nomini Tuo da Gloriam.