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In my experience the AK-105 doesn't have an issue with being undergassed. It'll function fine without a booster in normal use. The 105 has a longer barrel so it's booster can be 30% smaller than the one on the AK74su. The booster was added as an insurance so that the 105 will always be reliable...

This isn't quite right, it's the opposite. Shorter barreled AK tend to be undergassed. Shorter barrels have less space for gunpowder to adequately burn and build gas pressure. Its evident by the fact that short barrel rifle tend to have alot more muzzle flash. Its because some of the gunpowder...