It is correct. Here another thng you might want to learn: 'll try (one) later (redirected from I'll try them later) I'll try (one) later I'll try to see, meet with, or talk to you at a later time. I'm afraid I have to go now, but I'll try you later. A: "He's not at his desk, I'm afraid." B: "That's fine, I'll just try him later." I hope it helps.

Yes, "I'm gonna go try them on" would definitely be correct. If you want it to be a bit more formal you could say "I'm going to go try them on" but they get the same point across!