First off, welcome.
Your picture is really dark, but from my medium trained eye it looks like a Sport II. I can see the forward assist and dust cover, I can see it has the A2 front sight post but it looks like maybe someone replaced the stock handguard with a drop in quad rail. Definitely not a T or OR because of the A2 post, not an X because no M4 barrel profile and not a Magpul MOE.....so that leaves Sport II?
Others opinions?