What Are These Indentations On My Brass?

A photo would help

yea pic. is it marks like staining or marks like gouges or scratches?

No problem, load them up and shoot them. An AR can do that as the case is ejected. I’ve no idea how many of those I’ve made and loaded.

That's the deflector on your AR. There is a little pad to stop that from happening. No biggie- they are fine to reuse.

Cheers,

What gun

https://www.amazon.com/dp/B06XKYLB8J/ref=cm_sw_r_cp_apa_i_44X6TCGK5HWRFKN5E55R?_encoding=UTF8&psc=1


Here is a link to the "deflector brake"

Could be over gassed slightly

Look up what a PTR91 or, far worse, a Hakim will do to brass!

If you want for of those marks a bit of thin sticky backed foam around the back of the ejection port will do it.

Most production AR's are over gassed so they will cycle whimpy, cheap steel cased ammo. Put some hot, NATO spec ammo in them and they become WAY overgassed.

A heavier buffer will help but, ideally, a gas port with the correct diameter is in order.

Like said impact marks from the brass hitting the deflector during injection. Also the ejector spring in the bolt by default way too strong. The military wanted the chamber cleared with no chance of a jam. I cut about 1-1.5 coil off the ejector spring. For a test with the BCG/bolt out, place a piece of brass under the extractor and flex it back to the bolt face. The release and see how may feet it throws the brass, new ones 10'+. With the cut spring it reduces that distance to 1/2. This also reduces the force the brass is slung against the deflector.

At what direction is the brass being tossed? Forward....

On a properly tuned AR the ejection should be in the 3:00-4:30 direction.

mrawesome22-250 said:

Most production AR's are over gassed so they will cycle whimpy, cheap steel cased ammo. Put some hot, NATO spec ammo in them and they become WAY overgassed.

A heavier buffer will help but, ideally, a gas port with the correct diameter is in order.

Click to expand...

Agree a heavy buffer is a help. I ended up with a heavy buffer and adjustable gas block.

It will help but all gas guns do this to some extent M1As and AR-10s are worse.