If Windham is like the old Bushmaster as they claim to be you're likely to see non-mil spec components such as commercial diameter receiver extensions, commercial height sights, BCGs, barrels, etc. Compare that to Spikes and PSA in the same price range.
Hey no one's saying you have a crap gun just that there are better known choices. I have an ArmaLite, it's a decent AR but that's all, there are better choices today which is why you don't see me touting it to new AR buyers.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek