I own a US marked bayonet that fits on both the M-1840 and the M-1842 muskets. The blade is 18" long, but has "square shoulders", much like the shorter blade used on the M-1816/20 musket; rather than the tapered shoulders, that you normally see on both M-1842 & M-1855 muskets and rifle-muskets.
Is this square shouldered bayonet the "correct" one for the M-1840?
Is this square shouldered bayonet the "correct" one for the M-1840?
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