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If anyone is contemplating the conversion of a 7mm Remington Rolling Block rifle, then check it over carefully. It could be worth a fair bit of money as it is in original shape. I recently came across one at a Gun Show, but someone had taken a $2000 Royal Navy 7x57 Remington Rolling Block and converted it to a $500 Black Powder rifle.
In 1915, the British were desperate for small arms to provide smaller Royal Navy ships with SOMETHING for personal defence. The Short Magazine Lee Enfields were surrendered to the Army, and even the Royal Marines had to give up their SMLE rifles.
The Financeer, J.P. Morgan acted as a Purchasing Agent for the British, and along with some Winchester 1892 and 1894 rifles and Carbines, some Remington 14 1/2 Carbines, there were some Remington 7mm Rolling Block rifles purchased. I attended a Gun Auction last month, with about 1000 people present, and everyone wondered why an old Remington Model 14 1/2 pump gun in 44-40 went for such a high price. There were three people in that room who knew, me, and the guy who paid $300 more than I was willing to pay and $50 more than the third guy.
The Canadian Government sent Inspectors to Proof and Test the Pattern 14 rifles being produced by Winchester, Remington and Eddystone, so these Royal Navy weapons were also inspected, proofed, and marked with a Dominion of Canada proof marks and a "N" for Royal Navy.
While not really intended to shoot at an enemy battleship, if you were on board a Tug Boat, a Picket Boat or a Harbour Net Minder, even an old Rolling Block rifle in your hands would be a lot better than a Club, especially when the possiblilty of a floating mine might be encountered.
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