Sabre Defense Upper Jamming

[MickeyM1212]

Hello there Rifle Gear, I bought a Sabre Defense Complete upper from you and no matter what I do, it just seems to keep jamming. I tried different ammo, different magazines, lubing it very generously... no matter what I do, I cant seem to keep it from jamming. Do you know what is going on? Did I just get a bad one? Please let me know what I can do.

Sabre Defense M5 Mid length Upper 14.5" barrel for $899.99

Thank you very much.

[BONECUTTER]

Hey Mickey,

I posted links to your two previous posts to save all the questions listed in those posts.

At the end of the day because you are not that familiar with AR's its going to be next to impossible to trouble shoot it on the internet and bringing it by the shop is going to be your best bet. To me it sounds like it can be a few things but these are easier checked in person then asking you to do so.

http://www.calguns.net/calgunforum/showthread.php?t=221106

http://www.calguns.net/calgunforum/showthread.php?t=234935

[Riflegear]

What Bonecutter said... we can't tell what's going on without physically looking at your rifle.