(adsbygoogle = window.adsbygoogle || []).push({}); On solo i cant find the part in the tunnel??

Look on youtube, there's 3 spots in the tunnel

If your coming from the Depot, in the tunnel the piece will either be; on the left near the wall with a hole where zombies spawn from, in front of you by a car near the lava and the most common place is by the walk way where the M16 is, like the last post said YouTube will give you a better idea, hope this answers your question.

Spot1: Beside the M16 Spot2: Behind the back ass car Spot3: Beside the cone