Rifle, Anti-Tank, .55in, Boys "Boys Anti-Tank Rifle" - Tank Encyclopedia
Experimental PTR RES anti tank gun from 1942. 20 mm bullet was based on 45 mm casing, that gave it velocity of around 1300 m/s with roughly 60 mm of penetration at
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Walfas Weapons: Lahti L-39 Anti-Tank Rifle by RED-IMPRISONER on DeviantArt