Bolt B4 Gears Shattered

[Don7074]

Just tried my stock Bolt PMC for first time in ages - expensive sounding crunch then spinning motor, zero compression. Opened the box and 1 gear completely stripped, 1 lost a single tooth and 1 ok. Motor gear’s undamaged. Dummy bolt / blow back parts cracked too. Eventually found bolt parts from Germany after ordering from uk company that doesn’t say they’re back order until after you order and pay for them ?? - question is, use stock bolt gears when no obvious reason for originals to self destruct (apart from blowback MIGHT have jammed / stuck on gearbox going by marks on dummy bolt and gearbox shell) or what aftermarket brand / ratio ? Don’t want sky high rof, just reliable. Will have blowback disabled permanently at rebuild but keeping the stock recoil parts. Any tips on a gun tech Dundee area be good, doubt I’ll be getting KOA or Airsoftworld any time soon.