Yup that is the buffer mine has. It is a slick side. I have the list of guns somewhere from from when Bob's sister sold his collection. I will have to try and find it. I have the 606 his old 605 and Belt Fed.
Originally Posted By leid:
The one I took a run on was marked "06A" with no property marks & had a USGI M2 bipod just like the M14E2. It had a side assist, hard chrome carrier, white plastic with steel core buffer that had the general shape of an Edgewater Spring Guide. Yours have that also? I do not know how many AR15/M16/M16A1 models Bob had. Somebody, might have been Buddy, stated that Bob had one complete set 601 thru 649 and was working on a second set.