Mark left on brass

[SDawson]

After putting 250 rounds through my new RIA 1911 Match model, I noticed that each piece of brass had a mark on the base that looks like the extractor is hitting the base somehow. Please take a look at the picture of the brass, mark is on lower face at edge, and let me know your thoughts about the cause, any concerns and a fix. I have had no FTE's.
Thanks

[Alex$]

Completely normal, when the extractor is forced over the rim it causes this mark. When you are done with break in it will be less noticeable.

[edwardm]

Completely normal, when the extractor is forced over the rim it causes this mark. When you are done with break in it will be less noticeable.

The 1911 is a controlled-feed firearm. When the top-most round in the magazine is stripped off and begins to feed, the nose of the bullet hits the feedramp and starts to travel upwards towards the chamber. About this time the rear of the round starts to break upwards and the base of the casing starts to move into position to be parallel with the breech face. As this motion occurs, the rim of the 45ACP case slips upwards and behind the 1911's internal extractor.

At no time during the feed should the base/rim of the round be in front of the extractor. If the extractor is pushing the base and 'snapping' over, there is a problem with the firearm (and eventually either the extractor hook will break or the extractor will lose its proper tension.

To the OP, those marks on the brass are from the casing impacting the ejector, and they're totally normal.