First 300 blackout build, question about brass and buffer

**usmcvet** · 16 March 2016, 06:51

Yeah mine does the same thing too. I thought it was strange but chocked it up to the difference in the neck of the case. My buddy who reloads was all freaked out. I did not care because the gun ran well.

**SINNER** · 16 March 2016, 07:18

Every .300 BO I own does this. As mentioned it's due to the case length. The spent case ejects earlier in the BCG's cycle and has time to rotate before it strikes the shell deflector. I built a slick side .300 I wound up giving to a friend because 75% of the cases bounced off my cheek(I'm a lefty). I have slick sided uppers on 7-8 rifles of various calibers and have never had that issue with any other ones. The annealed cases actually come out looking worse due to the softened brass.

**Joelski** · 16 March 2016, 08:12

Hmmm, then why aren't mine doing the same thing?

Curious.

**usmcvet** · 16 March 2016, 08:33

Originally Posted by Joelski

Hmmm, then why aren't mine doing the same thing?

Curious.

Do you have a shell deflector?

**Joelski** · 16 March 2016, 10:31

Yep.

**mustangfreek** · 31 March 2016, 02:54

Was back out tearing up some other loads, looking them over as usual, dented to crap on some and not much on others.. went home cleaned up a little and looked harder, I mean some of them the lip is bent to shit..

Most of these cases were FC marked converted brass , the factory S&b seemed to be the least dented..

Part 2, didn't put anything on the deflector, but thinking I should? Try a heavier buffer , has a carbine in in it now, maybe a H, or H2 like said above, which I don't have on hand for testing..

Shoots brass at about 3-4 o'clock 5/6 foot , depending

H110 reloads

110gr testers

Factory S&B 124gr fmj

I guess I'll bring out a H buffer next time, but I'm a little iffy using done of them tweaked/ twisted neck cases..

**Joelski** · 5 April 2016, 09:48

This is after 360 rounds saturday. The AXTS BCG must have a strong ejector spring?

**bzdog** · 5 April 2016, 20:57

Joelski, is yours missing the deflector all together? Mine (with pistol gas/h2) showed the brass marks right away:

Sent from my iPad using Tapatalk

**mustangfreek** · 6 April 2016, 02:01

Same ? Joelski missing it completely or are you covering it with something?

Mine looks like bzdog

**Joelski** · 6 April 2016, 03:30

I don't cover the deflector. Those casings aren't even looking at the deflector on their way out. Puzzling.

**DUX** · 7 April 2016, 14:48

If your rifle is timed and balanced and you have a 4 coil spring, black stand-off, and rubber o-ring or delta-ring in your extractor, the brass won't hit the deflector. As the extractor spring ages it will, minimally. The brass will all pile up at about your 4 O'CLock about 5-6 feet away in a neat little pile. Having a rifle that balances just under the chamber--right behind the magwell--and properly timed (I heard one guy here call it tuned and that's fine too) is critical to having the platform function like that in my experience. Joelski's picture doesn't lie. All my AR's do the same thing.

**mustangfreek** · 7 April 2016, 19:14

Kinda not sure on that comment about balanced and timed has to do with this, tried different spring/ insert in extractor and no difference, have yet to try a h buffer to see..mine land at about 4 o clock but after hitting the deflector..

**DUX** · 7 April 2016, 19:23

Originally Posted by mustangfreek

Kinda not sure on that comment about balanced and timed has to do with this, tried different spring/ insert in extractor and no difference, have yet to try a h buffer to see..mine land at about 4 o clock but after hitting the deflector..

The balance and timing keep the rifle more stable while firing. If one side is heavier than the other you get a rocking boat effect. Your extractor spring may be older. That's my stab at it.

**Deadwing** · 7 April 2016, 19:37

Originally Posted by Joelski

I don't cover the deflector. Those casings aren't even looking at the deflector on their way out. Puzzling.

I've got 5.56 guns that eject like that and miss the shell deflector completely. Others, ejected cases beat the deflector like it owes them money.

Originally Posted by DUX

If your rifle is timed and balanced and you have a 4 coil spring, black stand-off, and rubber o-ring or delta-ring in your extractor, the brass won't hit the deflector.

A strong extractor spring, insert, and o-ring will certainly aid in getting the case out of the chamber, but probably don't do much for ejection.

**Brahmzy** · 7 April 2016, 19:38

My 300BLK does the same thing. Uber dents just like pictured.

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