Bolt Carrier Odd Markings

[tpirovol]

Hey Everyone,

Was cleaning my Colt M4A1 last night and noticed grooves in the bolt carrier. All the rest of the bolt is pristine but both sides of the bolt carrier had grooves. When I first got it and went to clean the rife for the first time I tried to insert the bolt carrier backwards (I know stupid). Is this from that or from the factory? Should I be concerned?

Thanks T

 

[jethunter]

Looks more like a dent than a wear groove. But if it's been working then I wouldn't worry too much.

 

[derrob7]

I'm pretty sure those grooves are made by the mill during the machining process. There is nothing in your receiver hard enough to make those marks other than the trigger group and that runs in the cutout portion of the carrier. If there was it would be bright and shiny as the Parkerized finish would be worn off.

 

[tpirovol]

Thanks guys appreciate it