With a heavier gun, he'd probably have knocked the tyrannosaur down, and saved his own life.
7 seconds sound clip from the X Minus 1 - A Gun for Dinosaur by L. Sprague de Camp classic radio drama series.
You can hear this line at 00:27:50 in the radio play.
Quote context
[...]
- You can't have paradoxes, you know... just isn't done.
- And, you see, I'm a lot more careful now.
- I shouldn't have taken James when I knew what a spoiled, unstable sort he was.
- Or Holtzinger, either, when I saw that he was too small to shoot a dinosaur gun.
- With a heavier gun, he'd probably have knocked the tyrannosaur down, and saved his own life.
- So... that's why I won't take you to that period to hunt.
- I'm sorry, but you're just too light. You're not big enough to handle - a gun for dinosaur.
[...]