I have an ODG Gen 4 G19 and LOVE IT. There are way better guns out there probably, but GLOCK has deff improved on the last model. I got mine for a smokin deal at OVO so that was a plus also. The gun is fun and never has a single issue, it just eats rounds no matter what they are.
I've bought and sold cars with Denny and Lyle for years and he's always given me what I've asked for my cars when I sell them, and sold me cars for cheappp
OP- mine did that on my 08 silverado and it was the tensioner making noise.
Also, never trust the OEM rocker arm needle bearings, always replace them with Comps a Trunion Kit.