Originally Posted by TekGreg
Quentin, absolutely correct, from what I can tell. The more tuning you do, the more specialized the platform becomes and the more finicky it will be about accepting types of ammunition and bullet weights. Manufacturers have to make a gas system that will devour every known weight/powder combo on the market and therefore are extremely limited by what can be put on a production gun.
Very true, and that's why so many manufacturers have boring guns, they've got to work with almost all ammo a customer is likely to use, otherwise customer support will be a nightmare. When someone takes it upon themselves to assemble their own AR, he has to get up to speed quick on many issues or end up with that "finicky gun" no one wants. Tuning is great if you know exactly what's going on but for the average person it adds headaches.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek