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Front heavy is gud not a bad for a rifle like AK specially to bring down the muzzle climb, Look at the second photo of the spetnaz with AK, Notice his heavy muzzle flasher to reduce the muzzle climb, IA is stressing on Vertical Foregrip for that very reason ..
The optics does not sit on the gas tube but thermostat furniture over gas tube, Thermostat is heat resistance material used in modern rifle`s furniture, besides IA use red dots at front includes raptor sight and aim-points in past without mounting on thermostat furniture..
Credit : Bornubus
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Regardless how much one claim it retain zero its impossible to retain absolute zero as the construction of the rail is on AK`s dust cover itself ..
The optics does not sit on the gas tube but thermostat furniture over gas tube, Thermostat is heat resistance material used in modern rifle`s furniture, besides IA use red dots at front includes raptor sight and aim-points in past without mounting on thermostat furniture..
Credit : Bornubus
============
Regardless how much one claim it retain zero its impossible to retain absolute zero as the construction of the rail is on AK`s dust cover itself ..
However,rail on hand guard along with the sight would make the rifle front heavy and disturb the balance.Plus the sight can easily get damage due to excessive heat.