Hi Bob, good going on getting a buffer and spring arrangement. I know that Slash's setup is very expensive so what you did is probably good enough. I hired a gunsmith to lap the front end of my upper to make it perfectly perpendicular to the uppers bore. We had to have a special lapping tool made to accomplish this. On Monday night we use tool to lap upper and then install barrel, I am going to polish the lugs of my barrel extension today using dremmel tool, a few spots need to be cleaned up. But tomorrow night my upper will be 100% complete with a barrel that is as aligned with the upper BCG as it can be, thanks to the lapping. I received Pmags yesterday and fitted them into he lowers mag well and they are not too tight in there so good. There is some wiggle in there though with the Pmags moving about 1/4" front to back if movement measured from bottom of magazine. I dunno if that is good or bad. Now I have to wait for the scope I want. It will come available later. SWFA should do a group buy at another web site that I frequent, they may do it middle of April but when will they start to ship their new 1-6X scope? IDK hopefully by May, oh I hope so. So unless I get some other kind of sight package first I still have a wait. But this will give me time to collect lots of components for doing hand loads. Besides all that I want a bi-pod and a sling and if the Pmags work good I get more of those. I think that should do it? I hope so.......