Direction of spent brass?
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Old 08-11-2008, 10:21 PM   #1
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Default Direction of spent brass?

Having fired a number of ARs, most tend to spit the brass forward and to the right or directly to the right. My Stag spits them backward pretty far (the brass deflector has chips as a testament to this) and a little to the right.

Is this a) "normal" in the grand scheme of things and b) something that can be adjusted easily enough so it kicks 'em more directly to the right?

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Old 08-12-2008, 12:46 AM   #2
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my bushmaster throws them to the right and back some also

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Old 08-12-2008, 01:42 AM   #3
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In the "grand scheme" of AR brass-throwing, models with the case-deflector "bump" behind the window influence the degree of "scatter" of casings. The no-bump models are fairly reliable to throw in a consistent direction. We are talking about other variables being constrained here, such as loading, type of brass, etc.

No semi-auto rifles which I have had the good fortune of firing extensively "throw" brass further, or distort it more, than H & K rifles. Count on M-91 to throw as far as 50 feet!

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Old 08-12-2008, 12:27 PM   #4
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Back in the day when I wore a green shirt to work every day (GRIN!) we had m-16s made by Colt- eject 45 degrees to the REAR, and General Dynamics- 45 degrees FORWARD. Never issue the Colt to a lefty- will throw hot brass down the front of his shirt! Just minor differences in milling, spring tension, etc. Of course my Chinese SKS seems to eject straight up- shoot under cover, and it rains brass!

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Old 08-12-2008, 01:47 PM   #5
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Quote:
Originally Posted by bkt View Post
Having fired a number of ARs, most tend to spit the brass forward and to the right or directly to the right. My Stag spits them backward pretty far (the brass deflector has chips as a testament to this) and a little to the right.

Is this a) "normal" in the grand scheme of things and b) something that can be adjusted easily enough so it kicks 'em more directly to the right?
I have been a little reticent to weigh in on this issue, because honestly I am doing some research on Bolt Carrier Groups at the moment for my Creedmoor project and my head is swimming with opinion, claims and other BS that the internetz is famous for. On top of that, is not an area where I will even claim 100% understanding, let alone expertise.

What I do know, is that like with a bolt rifle, the harder the bolt comes back, the more force is generated on the "push" pin that presses on the ( left ) side of the empty shell while the extractor holds the ( right ) side, and thus the shell is sent to exit stage right.

If you have hot loads, causing more chamber pressure and the bolt is coming back nice and hard, you increase the pressure on the "push pin", thus applying more force in it's forward motion. Now, if you couple that with a nice, solid extractor, that is holding onto the shell like it was supposed too, the empty will go past the 90 degree to chamber arc on it's way to the ground, which could result in why you are seeing them go back, instead of out.

If you are getting a positive release, and the shell is clearing the gun in the same way, or close to it, with each round - and you don't have any FTE issues, I wouldn't worry to much about it. After all, if the brass is going out, away & behind you, you don't have to worry about stepping on it when you advance on the Zombie Hordes.

Hope that helps -

JD
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Old 08-12-2008, 01:48 PM   #6
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The only thing I can think of that might have some effect on that would be to change/modify your extractor or buffer spring. But then again, by doing so, you could be opening up a bigger can of worms. Out of all the AR's in the house, I've got some that throw forward, some back, some to the side, and some straight up. But I agree with the previous poster, none that throw as far as any of my H&K's. Even the Century CETME and G3 throw brass about 3 lanes over at the range. Makes friends with folks real fast

Does it do that with any particular ammunition or some worse than others? You might try a few different brands/styles and see if there is a pattern. I know a few folks who have modified the receiver by adding a bumper pad on their deflectors to try to alter the direction of the casings. Not sure how long that would hold up though.

I would try playing with different ammo first.
Slo

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Old 08-12-2008, 04:31 PM   #7
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No FTEs and it seems to do it with all the ammo I've tried. (Haven't tried the SS109 stuff I bought a while ago.) It's not really a problem, but it does send the brass pretty far -- a couple lanes over.

The last time I was at the range, my spot was diagonally to the left of the doorway, and some brass went out the door and into the parking lot.

The easiest cure is probably to buy a brass catcher. It'd make clean-up a lot easier.

This isn't a problem. My friend's Colt sent them pretty much to the right, and another friend's Rock River sent them forward a little. Just curious how/why this is. NBD.

(I'm a lefty and it's not sending them so far back that they're going down my shirt.)

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Old 08-12-2008, 05:44 PM   #8
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Well, I guess there could be much worse problems - like refusing to eject at all.

JD

You know, it just dawned on me what you said. You have an indoor range that lets you shoot your AR's? That's pretty cool. We have one range here that is like that, all the others you either have to be a premium member or it's not allowed all regardless of who you are.

The one indoor range is like the Wild West though - right in the middle of the city, and doesn't have jack do-do for a range master. I honestly feel like I am taking my life in my own hands just into that place. The next indoor "cleaning misfire" or "accidental discharge" that kills someone in this area will probably be on Central Ave in Kent...

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Old 08-13-2008, 07:55 PM   #9
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What buffer weight are you using? What carrier are you using?

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Old 11-12-2008, 06:00 PM   #10
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yes, H&K firearms do have a 'very positive ejection' for the most part, across pretty much all their line-up compared to most other makes, i've personally witnessed brass thrown by H&K Rifles to dig into barricades & other wood obstacles on the range, the sharp brass at the case mouth sticking into the wood on 2 seperate occasions, they were thrown that hard..someone said it might have to do with fluted chambers, & unique nature of the extraction because of, but not being a qualified H&K armourer, i cant say for sure, but your not the only one to notice, mate ..i assure you!!

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