Milspec is an interesting discussion. First, its exactly that, the government standard. That means it's what the government is willing to pay for under a competitive contract bidding situation, to get a rifle that meets their performance standards.
2MOA, not sub MOA. Mean rounds to failure past 5,000 rounds, not 50,000 rounds. Bolts that need replacement around X number of rounds, which they can't record, so it's inspect in place and replace when cracked.
At one time, cut barrel rifling because that was what Colt would pay for, when the majority of pistols and most modern battle rifles had long since moved to hammer forged. And those barrels delivered better accuracy, higher bullet speeds, and more durability across the board.
The M16 and M4 are built to a standard, but also to a price. Contract prices are known to be as low a $650, it's negotiable. What raises the price is testing every part, documenting it, then adding that paperwork trail including the labor to do it to have a package for a government inspector to rate compliance.
There are more durable materials, better processes, and higher standards that could be exercised, but the combat rifle is a 2MOA bullet launcher and all that extra expense wouldn't mean X more hits on the enemy for the dollar. That's where the milspec discussion gets even more interesting as some will say it's the best there is, where others know it's just a minimum standard, while others point out that a rifle costing 3X more simply won't hit 3X more enemy. Only the shooter can do that.
The proof in that argument is that the FN concept rifles retailing for over $2000 are no longer going thru any further development by our special forces as there's no measurable, documentable improvement for the money. We can choose sides and discuss it until the cows come home, but the "milspec" issue rifle really isn't all that, and frankly, we don't need much more. It's a pretty simple spec and I believe what the real issues around whether one is, or not, is simply supply and demand. We can't get enough of those parts, so the makers have to discount their wares to move them. If they can get the parts, they can price it where the market can bear it - whether the parts were all that more expensive or not. They aren't saying.
Goes back to that Colt contract price at under $650, but retails for $1,100. Somebody is making a cut in the supplier chain, Colt sells hundreds to distributors, distributors sell tens to the local long gun store. Got to pay for their overhead and shipping each step of the way.
Do we buy a $650 milspec gun or an $1100 milspec gun? Yes is the actual answer, it's not represented by the price as we see it in the armory rack or the gun store rack. And the cheaper gun might be more accurate than the expensive one. Or not.