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Whitworth Compressed Fluid Steel barrels were first used on the Grade 7 AAH Pigeon Gun in 1894, Titanic Steel barrels were introduced for the Grade 3 in 1897, and Acme Steel for Grades 4, 5 & 6 about 1910. The Grade 8 A1 Special introduced in 1912 also had Whitworth barrels until after WWI, then Peerless Steel.
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