The '''AO-63''' ({{lang|ru|Автомат АО-63}}) is a Soviet two-barrel AK derived [[assault rifle]] chambered for the [[5.45×39mm]] round. It was designed by [[Sergei Gavrilovich Simonov|S. G.Sergei Simonov]] and [[Peter Andreevich Tkachev|P. A.Peter Tkachev]], and manufactured by [[TsNIITochMash]]. It uses a side-by-side barrel configuration, and it can reach a maximum [[rate of fire]] of 6000 rounds/min when fired in two-round [[Burst mode (weapon)|burst mode]] with a 0.01 second delay to increase ballistic performance, making it the fastest-firing assault rifle known.
==Development==
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==Overview==
The AO-63 is a [[gas-operated]], 5.45×39mm calibrecaliber, twin-barrel assault rifle derived from the [[Kalashnikov rifle]]. The weapon has side-by-side barrels with the right barrel predominant, twin rotating bolts/gas pistons and ejects from both sides. The trigger group has a 3-position selector on the right side of the receiver; the first is semi-auto firing one barrel, the second in full auto firing both barrels with a 0.01 second delay, the third is unique as at first it fires a two-round 6000rpm burst then one barrel in 850rpm full auto. The magazine is unusual as it has the main double column holding 30 rounds with a single column holding 15 rounds.
