Despite the fact that the AR-18 was generally considered to be a simple, accurate and reliable rifle, it still suffered various malfunctions during its evaluation trials carried out by different countries including the United States and the United Kingdom. During the US trials, the AR-18's performance was found to vary depending on ammunition used, and the evaluating board concluded that the AR-18 would require additional minor changes before it could be considered for adoption as a service rifle. The British Ministry of Defense found the gun unsatisfactory during mud and sand trials. The rifle was also known for its loose folding stock, which caused problems after extensive use. In 1965, Armalite made several minor modifications to the design, but unfortunately, no army was interested in acquiring a new 5.56 mm service rifle.
As mentioned, the AR-18 is a simple, cheap and considerably reliable gun. However, malfunctions may still occasionally happen and the rifle's reliability seems to depend on the type of ammunition used. Harsh environmental conditions (dirt and mud) may also have a negative impact on its performance. Moreover, the hinging mechanism of the folding stock is prone to becoming loose (especially after extensive use), which makes the stock wobble.
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