Need a little more elaboration then that, is the sear actually sticking or is the marker randomly rapid fireing when you shoot it? How many shots have you shot threw your marker up to this problem?

1 If the sear is actually getting stuck-- clean your marker well, make sure there is no build up of paint or grease or anything sticky near the trigger assembly.

2 If its randomly rapid firing -- check the sear tip (the part that catches the bolt) make sure it is a nice and clean 90* angle, same with the rear bolt, make sure where the sear catches is not beat up or rounded off. It does not take much wear to notice a problem.

3 Another side note -- it is possible you switched the sear spring with the trigger spring.

I would try 1 and 3 first

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I get asked "Why?" alot. Why do you do this? Why did you do that? Why would you think of such a thing? WELL HERE IS MY ANWSER..... BECAUSE I CAN!!!!!!