In the end of the episode when Gemma and Clay are getting on Clay's motorcycle they both place their helmets on their head but don't hook the chinstrap. When they are seen driving away they both clearly have the chinstraps hooked and not hanging freely like they were moments before.
At the beginning of the show when the men buying the AKs are test firing on full auto there is zero kickback from the weapon. On full auto they should be firing in small three round, controlled bursts or their shot pattern would go up into the sky.