Make your own
Upper half
BCG
Charging Handle
Upper Receiver
Forward Assist
Ejection port cover
Barrel
Gas Tube
Gas Block
Muzzle Device
Handguard
Sights
Lower Half
Receiver
LPK
Grip
Trigger Guard
Extension Tube with parts
Stock
With all of that, there are a lot of things you could change depending on what you want. After market trigger, forward grips, rail sections, buffer etc.
Buy a complete rifle. Learn with it and upgrade as needed.
AR parts are very interchangeable so pretty much any one can throw one together with basic tools - but if everything was perfect every time, we wouldn't have "my AR doesn't work" thread every other week.
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