Assuming you mean the sear bar on the upper receiver and not the "L" shaped transfer bar inside the sideplate;
If your sear bar popped completely off the upper frame then it had to have come out from under the sear spring, perhaps breaking it in the process.
Is your sear spring still present? Does it have a slight curl at its end?
If the spring is still intact, you will have to remove it from the dovetail slot in the frame by working it forward off the upper receiver. Once the spring has been removed you can properly seat the sear bar into its channel, (it should slide in at an angle). Once the sear bar is in, then replace the sear spring by reversing the procedure for removing it. The sear spring is what holds the sear bar in place. Without it, the sear would just drop out.
Good Luck!
Just realized this is for a .22 Sorry.
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