Yes it is.... Has the vortex flash hider vs the bird cage. I purchased it in October 2000. When I said ok to the purchase, the seller out of Washington state told me it had a Colt M4 upper, Colt M4 4 position telescoping stock and Colt M4 Handguard mounted on a NIB Bushmaster lower. With that, I took the upper and put it on a preban colt lower I had so I built a Colt M4 back in 2000. It has never been fired by me and, I did verify with Bushmaster that it was a preban manufactured 6/94 as a complete rifle before the purchase.
I can Email you some pictures of it if you would like? Send me an IM message with your Email address and I will go out on yahoo and send the pics. OK... I am in and out of the house today as it is my day off so, will get the pictures to you as soon as I can.
Thanks for the inquiry