Hey everyone just found out from my friend TopGun's YouTube video https://www.youtube.com/channel/UCNL...fpd6yz2-VZ7Yqw
That you can complete the solo challenge 3 using C4 instead of a crossbow. Here is a short video showing him complete the challenge. If anyone figures out another way to do it now post it. I'm thinking mines, M203, and even the armored Unidad vehicle.