![]() ![]() “It has been found that during extended endurance firing tests, a gun barrel can exceed 1,000 F. Sullivan patented his handguards for the AR-10 in May 1957, explaining that: Plastic shells filled with rigid plastic foam for the AR-10′s furniture. With background in the aircraftĪrmaLite’s main engineers put new technologies to good use and were ahead of the curve in their use of fibreglass reinforced I thought it would be interesting to compare the two.īoth of the handguards were designed for the same purpose, to provide a lightweight forend that would protect soldiers’ hands and allow air to circulate around and cool the barrel. I was recently doing some research into the ArmaLite AR-10 and early AR-15 prototypes and while looking at the original patents for the guns I came across the patents for both rifles’ handguards. ![]()
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