I have never seen this gun before, chambered in 5.45X39mm i saw a video of it and the barrel moves back when the gun is fired, and appears to have the gas piston on the bottom? wonder if that helps with accuracy at all, they give it to elite russian military and police, but the regular guys are stuck with the AK74's.

It's a very delicate rifle.

The military doesn't get it, because it doesn't have anywhere near the reliability of the Kalashnikov.

This AN-94, along with the AEK-971 and AK-107/AK-108 were finalists in the latest round of rifle buying from the Russians. These firearms were all supposed to be one-handed controllable during full auto firing, hence the weird/new recoil mechanisms.

The AEK-971 is also a 'delicate (prima)Donna' when compared to the Kalashnikov
AEK-971


The AK-107/AK-108 have simply got another gas piston that flies forward when the gas hits it to counteract the rearward movement of the bolt carrier.
AK-107

Sounds like a solution for a non-existant problem.

This indeed is a revolutionary firearm. It is the most advanced rifle available today. Having said that, the premise of this design is to increase hit probability which it does well. This is accomplished by the following; On the pull of the trigger, first round, the cyclic rate is 1800 rpm, this is so fast the first round is actually two. The cyclic rate decrease to 650-750 rpm on the third round. So on the three round burst, how this weapon is designed to operate, although fires three rounds it only sounds like two. With the reciprocating barrel and "whistle" type muzzle brake and the 5.45mm round the recoil is nil and all three rounds are grouped well. The down side of this system is the mechanics. Internally under that awkward looking handguard and causing the magazine to sit at a 60-70 degree angle as opposed to 90 degree in relation to the receiver, is a pulley and cable system. It is quite strange in configuration and significantly complicates the "in the field" take down/functionality aspect. It deviates from M.T. Kalashnikov's mantra of "all that is simple is useful while all that is complicated is useless." It is yet to be seen if this will be a viable, functioning weapon. At present the Russian army cannot afford it and Kalashnikov himself favors upgrading the 7.62mm round over the 5.45mm. The Russians have always been the world leader in functional, reliable, mass produced small arms so it will be interesting to see the future of this concept which is really a very clever and good idea.