W M. Muir and Co. Model 1861 Contract Rifle-Musket.
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William Muir and Company of Windsor Locks, Connecticut received a contract dated December 7, 1861 calling for 30,000 Model 1861 rifle-muskets to be delivered for a price of $20 each.
This contract was completed, with deliveries beginning on January 22, 1863 and ending on November 3, 1864.
I believe that there was a bit of a scandal regarding this contract as many of the arms delivered by Muir were of inferior quality, and reimbursement was made accordingly, with some being accepted at the low rate of $15.90 each.
There many different contracts awarded to manufacture the Model 1861 rifle-musket in addition to 265,129 Model 1861 rifle-muskets that were produced at Springfield during 1861 and 1862.
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If there is an inspector's acceptance stamp on the stock is is pretty obscured.
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.58 and .577 caliber paper cartridges are shown below.
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The bayonets below are Type 1 and Type 2 U.S. Model 1855 Bayonets that were used with most U.S. rifle-muskets during the Civil War.
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David