Please be sure to read the instructions carefully.
I kinda rushed it a bit, and though I didn't break anything, it would have been waaaaaay better if I'd taken my time.
It's particularly important to learn how to release the tension and de-cock the crossbow without firing it, and it does NOT involve pulling the trigger!
It's worth verifying that all the bolts are tight and that nothing looks like it's missing or out of alignment.
Lastly, it's also very recommend that you paper tune it before shooting at long range.
It's a precision machine and well worth the effort to do it right. I love my Tac15!