I took my 14.5" upper I built for my m16 to the range today and put it on my SBR lower.  While I was shooting I noticed the brass was going out and to the front of the shooting location about 3 foot.  It wasn't flinging it like my other ar15's do.  I even had some brass coming out and hitting my wrist.  Is something wrong I should check out before putting it on my m16 lower?  I think if it's anything it could be the ejector spring.  Any advice would be greatly appreciated.

Andrew

Sure, you can try replacing the spring. No harm done, you can even try a Wolff extra power spring. It could also be an over gas/under gas problem, dirty bolt, or different ammo.
Diagnose, Replace, Overcome.

Did this upper pass a short stroking test?