AR15 Brass Ejection

[lowery100]

I have a complete Spikes AR15 that functions 100% and ejects the brass neatly about 5-6 ft. to my right rear. I just finished building a new AR yesterday with several different mfg. parts. An Aero Precision upper, DEZ barrel, polymer New Frontier Armory lower. Only part missing is a BCG which is back-ordered until next week, hopefully. So, I wanted to shoot my newly assembled AR and swapped over my Spkies BCG and CH into my new rifle. Rifle shot great, functioned 100% only odd thing is it ejected the brass 5-6 ft. to my right front. Not really an issue I suppose just seemed odd. Any ideas as to why this is going on?

[c.a.willard]

Optimum ejection is to the 3-5 oclock position.  if it is going foward the gun is likely slightly overgassed. Basically it is a matter of which point in the cycle the rifle is ejecting.  If the rounds are going foward then it is ejecting while the BCG is returning foward.   I'd wait till your new carrier comes in and see if it is still the same.  If your new carrier is heavier it may go back to being around the 3 oclock position.  As long as it's reliable you dont really have to change anything, but if it bothers you you can always change out the buffer to a heavier buffer, this will slow the BCG down and likely get ejection back ino the optimal zone.    Also what ammo your shooting can alter the ejection pattern higher pressure rounds will result in a faster moving BCG and vice versa. 

[Oh Shoot]

I don't think it's written in stone, but this is often touted as conditions for different ejection patterns, assuming chamber isn't sticky, and there's nothing wrong with ejector/extractor and whatnot.

 

 

 

- OS

 

edit: echoes what C.A. just said, we were both typing at same time.

Edited January 5, 2013 by Oh Shoot

[lowery100]

Optimum ejection is to the 3-5 oclock position.  if it is going foward the gun is likely slightly overgassed. Basically it is a matter of which point in the cycle the rifle is ejecting.  If the rounds are going foward then it is ejecting while the BCG is returning foward.   I'd wait till your new carrier comes in and see if it is still the same.  If your new carrier is heavier it may go back to being around the 3 oclock position.  As long as it's reliable you dont really have to change anything, but if it bothers you you can always change out the buffer to a heavier buffer, this will slow the BCG down and likely get ejection back ino the optimal zone.    Also what ammo your shooting can alter the ejection pattern higher pressure rounds will result in a faster moving BCG and vice versa. 

That all makes sense, seems clear when it is pointed out.

 

 

I don't think it's written in stone, but this is often touted as conditions for different ejection patterns, assuming chamber isn't sticky, and there's nothing wrong with ejector/extractor and whatnot.

 

 

 

- OS

 

edit: echoes what C.A. just said, we were both typing at same time.

That is a very good diagram, never seen that one before. Very helpful. Thanks guys.

[Danger Rane]

Great diagram OS, thanks for sharing.

[itchytriggerfinger]

Love the pink side of the diagram!  :)

[Guest 6.8 AR]

So where did you find a bolt carrier?

[RWF]

love the chart, unless you shoot the same ammo all the time, why worry about it to much. but i got a question, a few 100 years ago a lefty could not shoot from any position without having hot brass down the shirt unless they had the plastic brass deflector. i guess most M16's must have ejected at the 4:30 position. i always believe they were over gased so they would keep running for exsample in a long engagement in the dirt and mud.

again great chart. i set up mine to with 223 and like the chart says the hotter the load the more forward the brass fell.

I don't think it's written in stone, but this is often touted as conditions for different ejection patterns, assuming chamber isn't sticky, and there's nothing wrong with ejector/extractor and whatnot.

 

 

 

- OS

 

edit: echoes what C.A. just said, we were both typing at same time.

[Lumber_Jack]

I'm getting a lot of brass on the deflector of my .300 BLK. I thought the gas block was adjusted fine, but in reality it's probably under-gassed. I'm gonna turn it up some and see what happens.

[Oh Shoot]

I'm getting a lot of brass on the deflector of my .300 BLK. I thought the gas block was adjusted fine, but in reality it's probably under-gassed. I'm gonna turn it up some and see what happens.

 

I can't quite wrap my pea sized brain around he over/under on the chart. Seems sorta like they would be the opposite, but the various gurus seem to basically agree with it, including Armalite itself.

 

Couldn't find the 5.56 version,but they say they spec the AR10 to fling them between 1 and 3 initially, and as the extractor and especially ejector springs age, will creep backwards to 5:00, at which point they say it's an indication to replace the springs.

 

Actually seems like the buffer spring would be a factor in aging too, but they don't mention it.

 

Mainly, I guess if it shoots every load/weight ammo you want it to reliably, regardless of where it's throwing them, maybe what's to fix? Or then again, if it's doing the 5-6:00, perhaps as things age you're already running on the edge, is another way to look at it too I reckon.

 

- OS

Edited March 19, 2013 by Oh Shoot

[frankmako]

good diagram, i saved it for later printing for my rebuild book/records.