Gunsmithing DB10 .308 feeding issues

[madpat]

Hi,

I have a big problem with my brand new DB10 18" SS. During feeding my DB something (feed ramps?) are scrateches my bullets. Does anybody know how to fix it?
It's brand new rifle before break in. I want to use it for long range shooting to 900y.

 

[EXTREMEPREJUDICE]

Ok, I'll bite..........................................................that's normal. Does it chamber fine?..............if so go shoot it.

 

[madpat]

Thanks for answer. I do not know the ar platform well and this scratches scared me. I’ll try it when I get a scope

 

[devolutionist]

I know this is an old thread, but I'm seeing the exact same thing on my new DB10 and wanted to know how this played out. Any resolution, OP?

 

[Black max]

It is normal. Get a Dremel with felt wheel and rouge and then spend half a day polishing the extension if your worried about. FYI, it won't change a thing

 

[devolutionist]

Yesterday I took a good look at it, and there was indeed a couple of sharp/rough machine edges on the inside of each ramp that was causing this. I did some manual sanding using a little 400 and a lot of 1000 & 2000 grit, and a good 80-90% of these marks are gone. Took it out today and it still cycles perfect (never had an issue with that).

 

[BAMAboy18]

On YouTube, the School of the American Rifle has a video where he shows how he did this to a SOLGW feed ramps.