Some of the best guns in the world are made and fitted by hand one by one, ie: out of spec. Your precious mil spec are only useful for Lego guns that you want interchangeable parts with not gunsmithing. Otherwise an "out of spec" buffer retainer that works and does it's job, is just as good, probably even better, that the spec one.
HAHAHAHA. I could really care less about hand made one offs. However you are correct that mass produced guns that subscribe to the interchangeability of parts doctrine(Like the vast majority of ALL goods) do in fact work without the need of a skilled gunsmith. Seeing as the rifle in question is one of these "Lego" guns you describe, it only further validates my statement of an out of spec part leading to more out of spec parts as being an issue. If the OP's rifle was a properly built to SPEC "Lego" rifle we wouldn't be having this discussion.
I'm curious what your definition of "some of the best guns in the world" is? I assure you that the guns that have made the most difference in the world and continue to do so are not hand one nor one offs. If we give your statement and it's thinly veiled correlation to the OP's rifle the benefit of the doubt, are we to assume that these "best guns in the world" that are "made and fitted by hand..." also fail to operate properly out of the box? If that is the case then the claim of "best guns in the world" is a bit of a stretch don't you think?
The more important aspect of my posts that seem to have alluded some here is this. Any manufacturer who cannot machine a lower to proper dimensions so as to have the buffer retainer pin do it's very simple and less than critical job, is likely a manufacturer who cuts corners elsewhere to either save money, time, or both. F**king up the retainer pin is minor, what will the next out of spec cost/time cutting measure result in?
Out of spec junk...why would someone mess with that crap? I guess you have a bottomless bank account, some of us have to compromise.
But with a little work it can be worth the effort.
With all the "gum flapping" you do about what is crap and isn't, let's see what your super duper in spec wonder rifle can achieve. I can make out of spec "crap" consistently shoot MOA or better with a hunk of beer can and 15 minutes of fiddling.
I must be The Great Gazoo.
I assure you my free capital is not unlimited. I do however understand the value of buying quality goods once and not low end junk several times. A quality AR can be had for equal money or slightly more than that of an NEA or other lesser quality brands. The problem lies in the people purchasing them. Most have no discipline or logic when it comes to financing a firearm(or anything for that matter). It's simply a matter of priorities. If you shoot a lot and need/want a dependable quality rifle then you will do your homework(that is to learn which brands are good and which are not) and find the resources(money) to finance that firearm. Working some OT, selling some other guns or gear or other hobby stuff are all easy options to supplement your budget. Smoking less(or quitting) as well as drinking less are other ways to save money, or you could just poke away some money and simply WAIT and until you have saved enough to buy a quality item.
It's quite a simple formula but most fail to apply it or any other similar formula. Instead I read about and hear about endless "collections" of low end garbage often referred to as firearms. If you have a "collection" then you're not really a "shooter". If you have several rifles/pistols/shotguns for different disciplines or purposes than you might be a "shooter". The guy with a half dozen milsurps, a frankenbuilt offshore parts AR, a knockoff 870 shotgun and an equally low end knock off SIG/CZ/Colt pistol is the same guy who will proudly shout from the rooftops how good of a deal all of his firearms were. The sad reality is that none of them were a deal as none of them were of a quality that matched the price tag. This same guy(or gal) will then defend their failing/failed firearms on this merit and this merit alone, branding all the nay sayers as being "brand snobs".
The point here redshooter is that having fewer guns of higher quality and using them is far better than the reverse. That would be called COMPROMISE. Can you really afford to compromise your already limited budget by buying an unknown brand of unknown quality? Only the rich can afford to buy cheap stuff..
As for your call out of performance.. It all depends on what you are trying to do with the firearm, what is its intended purpose/role. The right tool for the right job, THE MISSION DRIVES THE GEAR TRAIN. Buying guns or building guns without a defined purpose or role is an academic and economic exercise in futility. Tuning a rifle such as an AR to be a precision shooting tool is one thing. Replacing or repairing stock parts just to keep the gun from damaging itself or keep it working is another. I'm a big fan of guns that work and in the case of the AR a good milspec gun is a good place to start. I personally have no interest in cutting tiny tiny groups out of a stationary paper target from a stationary known distance. To do so involves a lot of effort in the build and a lot of effort in the ammo to maintain that performance, both of which bore me, as does the practice of cutting tiny tiny groups; All of which costs a lot of money that could otherwise be spent on other more practical aspects of firearms ownership like shooting and training.
My super duper in spec rifles work, which makes them far more effective than any rifle(hand made or production) that does not..