Whats Causing this?

[deerassassin22]

Wonder whats causing this shot my SCAR 17 for the first time notice almost all my brass has these markings. Its Hornady Match brass and not sure never had this happen.

Link to Photo's: http://s485.photobucket.com/albums/rr211/deerassassin22/Brass/

or

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[SGT TickleFight]

Re: Whats Causing this?

I shot a sig 556 a couple weeks ago that was doing the same thing. The brass is being spun 180 degrees as it is ejecting and hitting the side of your receiver or ejection deflector hard enough to damage the brass. I would bet you may see a wear spot on the side of the receiver where this is happening.

Try messing with the piston gas settings (if you can on the scar) and you may be able to stop this from happening.

 

[antagonist]

Re: Whats Causing this?

Might be that or it might be the neck hitting the lugs on the barrel extension on the way out. I get similar marks from my AR-15.

 

[zuke]

Re: Whats Causing this?

grind off a couple coil's on the ejector spring

 

[biner626]

Re: Whats Causing this?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: antagonist</div><div class="ubbcode-body">Might be that or it might be the neck hitting the lugs on the barrel extension on the way out. I get similar marks from my AR-15.
</div></div>
And this
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: zuke</div><div class="ubbcode-body">grind off a couple coil's on the ejector spring </div></div>
Cured it

 

[ejb]

Re: Whats Causing this?

yep from the locking lugs guys try cuting down the spring a coil at a time dont over do it