Ok here are the parts I bought back in March-May
-Lower receiver
-lower parts kit (includes trigger/hammer, retention pins for trigger and hammer, trigger spring, hammer spring, magazine catch, magazine catch spring, magazine release button. pivot pin, pivot pin detent and spring, takedown pin, takedown pin detent and sprint, safety, safety detent and spring, bolt catch, bolt catch spring, bolt catch plunger, bolt catch roll pin, buffer retainer and buffer retainer spring, trigger guard, trigger guard roll pin, pistol grip and screw.)
-receiver extension tube (also called buffer tube) If you want a precision AR, I suggest one for a rifle stock
-Stock...again a fixed rifle stock for precision
-Buffer spring (depends on what type of receiver extension tube)
-Buffer (see note above)
-IF you get a carbine extension and stock, you will need a lock (castle) nut and a locking plate
-upper receiver (try to get one already assembled)
-If you don't get one already assembled, you may need the forward assist assembly, (this includes a bunch of smaller parts....try to buy it as a unit)
-you may need a dust cover....again buy it as a unit
-Charging handle
-gas tube
-gas block (precision means low profile to me)
-free float hand guard for a precision rifle
-If the hand guard doesn't come with it, you will need a barrel nut
-If your barrel is threaded, a thread protector, flash suppressor or compensator
