+- 6.5 Grendel Forum (https://65grendel.com)
+-- Forum: 6.5 GRENDEL DISCUSSION FORUMS (https://65grendel.com/forumdisplay.php?fid=3)
+--- Forum: 6.5 Grendel ARs and Other Semi-Autos (https://65grendel.com/forumdisplay.php?fid=8)
+--- Thread: Flat spot on case mouth. (/showthread.php?tid=9014)
Flat spot on case mouth. - AZ. Old Guy - 02-14-2015
Not sure if this is the right plase to post this but. Shot my Grendel today for the first time an all the empty brass has a flat spot on the case mouth. Al were factory Hornady 123. Brand new gun. Sun Devil upper/lower with adjustable gas key Walther barrel. Not sure what could be causing this. Maybe slapping reciever on ejection??
Flat spot on case mouth. - Bwild97 - 02-14-2015
Shorten the ejector spring by about 1/10th of an inch, it's a bandaid solution but it works, and its cheap. You can also try applying the fuzzy side of Velcro tape to the deflector, even cheaper yet
Flat spot on case mouth. - AZ. Old Guy - 02-14-2015
I think it's hitting somrthing before the deflector. Each case has the same flat spot. I'm sure it will come out on resizing. It's about 1/5th of the diameter of the case. Maybe I should up the gas a little. Cases land about 3 feet back on the the ground. Bolt does lock open on last shot though.
Flat spot on case mouth. - kmon - 02-14-2015
Since you have an adjustable gas system, I would give it a little more gas. Less buffer spring like mentioned above could do it as well. An over gassed system usually ejects forward of 90 degrees of the ejection port which is what I am currently getting with mine, and will be replacing the buffer spring with a stronger one or replacing the gas block with an adjustable one.
I am sure this has been posted many times but
[url=
![[Image: ejectionchart_zpszy9bo7uo.jpg]](http://s159.photobucket.com/user/kmon1/media/ejectionchart_zpszy9bo7uo.jpg.html)
][/URL]
Flat spot on case mouth. - AZ. Old Guy - 02-14-2015
They were landing right at 3:00 about 2-3 feet out. I'm sure that they will run through the die allright just haven't seen that before.
Flat spot on case mouth. - Bwild97 - 02-14-2015
Keep shooting it, you'll see some brass coloring on your deflector like this
Flat spot on case mouth. - ricsmall - 02-14-2015
Most likely hitting shell deflector. Common problem. Shorten your ejector spring a coil
At the time till u like it.
Richard
Flat spot on case mouth. - AZ. Old Guy - 02-14-2015
It is hitting the deflector. Thanks guys for the info. What a great gun. Shot a 1.75" group at 200 with factory Hornady 123 Amax Match. Hope I can get my reloads to do that.
Flat spot on case mouth. - Bwild97 - 02-14-2015
Your reloads will do better!
Flat spot on case mouth. - coastguardchas - 02-14-2015
I had the same problem long ago, easy fix, cut a piece of sticky back Velcro and stick it on the deflector, vo-la, fixed.. Chas
Flat spot on case mouth. - AZ. Old Guy - 02-15-2015
Bwild97 Wrote:Your reloads will do better!
What's the special recipe?? I have TEC and H335 on hand.
Flat spot on case mouth. - rabiddawg - 02-15-2015
coastguardchas Wrote:I had the same problem long ago, easy fix, cut a piece of sticky back Velcro and stick it on the deflector, vo-la, fixed.. ChasSome things are better with a little fuz around it!
Sorry, couldnt help myself.
Flat spot on case mouth. - AZ. Old Guy - 02-15-2015
Copy that....