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It is about 1.8 inches
1.77165 inches
45mm = 4.5cm
45mm x 55mm is approx 1.77in x 2.17in 25.4mm = 1in ⇒ 45mm = 45 ÷ 25.4 in ≈ 1.77in ⇒ 55mm = 55 ÷ 25.4 in ≈ 2.17in
5.56mm x 45mm (5.56 is the diameter of the buller, 45mm is the length of the brass casing). NATO implies that this is THE 5.56mm round used by NATO forces. Similar to 7.62mm x 51mm NATO is the standard .30 caliber round use by NATO forces.
41 mm x 13 mm = 1.61 inches x 1.22 inches.
5.56×45mm NATO is a rifle cartridge developed in the United States
Round about 31 inches
45mm.
45mm
Assuming the "18 inches round" refers to the circumference, the area is 25.8 sq inches.
Most likely not much the 5.56 round's case is 45mm long and the AK-47 round is 39mm long, so the bolt won't close on the 5.56 round.