I have a TX200 that will not shoot consistently and I would like some idea about what to try first to find the problem so I can "sort" it. The rifle is a full length .177 TX200 in excellent condition that is well "run-in" and shoots very smoothly ,but it cannot hold a tight group without throwing a pellet way out of the park now and again. Changing the pellets makes no difference to this problem as although each pellet type may give a better or worse group, the rifle will still throw an individual (or a small number of pellets) way out of the group. I am testing the rifle whilst bench resting it at 10 metres (hardly a massive challenge) with a good scope, so I am confident that when this rifle throws pellets it is the rifle and not the technique that has failed. I have tested two TX200HC under identical circumstances and get consistently perfect results over a large number of shots so I can tell that this particular TX200 is different and is not performing correctly! The only thing I have noticed is that the safety catch button on the trigger block does not always engage every time the rifle is cocked, but every time that the safety button needs to be pushed off before the shot can be taken is probably going to be a "good" shot, whereas shots taken when the safety button fails to engage are often flyers. This could just be coincidence? I am going to swap a trigger unit block (complete) from my TX200HC and try it. I don't see why it should make a difference, but as it only takes a couple of minutes to swap them over, I may as well give it a try.