Some of the oldies have heavy triggers, although you get used to it quickly in a plinking session. The cadets(major) heavy and uncomfy shape. Couple of nasty triggers on early Airsporters & later MK3's (probably need a bit of a tune or maybe a polish). Also the Sterling HR81, one of my favorite rifles, has a harsh trigger, that takes the fun away a bit of a plinking session, need to take it apart some time to diagnose.
Ha @Geezer saw your post just now, so its not just me with the Sterling. Good to know.