Ahh the Victor Arms upper... what can I say. Actually the unit itself is nice I have one and like it a lot. However I only currently have one mag. I had more mags ordered and got ripped off by them for 2 ciener mags(which they basically stole). Ceiner mags, may or may not work in yours YMMV. I personally at one time got them to work (3Os) The unit itself comes down as follows and I don't have mine in front of me right now. Take the upper off (or break the gun open). Push the retaining pin out. Remove the side cocking handle. Bolt carrier will come out the back.
Any questions email me and I'll get mine to clear up the instructions. The only issue I have with mine is that the unit will not always lock the hammer back on either of my ARs. It feed and extracts fine, even real dirty, but it seems to not always have enough Ummpth to fully engage the sear and lock the trigger down to be released for the next shot. Ammo issue? I dont know. Also for whatever reason this upper seems queter than a 10/22 with the same ammo, neither is suppressed.
any questions let me know
Mike