Sorry for the long thread title..
But I'll be buying the S&W M&P 15/22 at Big R retail store here in Indiana and wondering how I can tell if the gun has been fixed for that ejection problem or it was something of that nature with a jamming issue? Is there a way to tell if that has been fixed on the gun before I buy it?
Perhaps a serial number?
Thanks for any replies that can help me with this subject, I plan to be an active member here with buying lots of stuff for this gun and to add to my Glock 23.
But I'll be buying the S&W M&P 15/22 at Big R retail store here in Indiana and wondering how I can tell if the gun has been fixed for that ejection problem or it was something of that nature with a jamming issue? Is there a way to tell if that has been fixed on the gun before I buy it?
Perhaps a serial number?

Thanks for any replies that can help me with this subject, I plan to be an active member here with buying lots of stuff for this gun and to add to my Glock 23.
