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AR lower parts build

Yes, I would buy from a reputable manufacturer. Some of the lower end kits include MIM parts and i have received out of spec parts from PSA before. Ones i have used that i really liked are ALG, White Oak, Sons of Liberty Gun Works, BCM, and Sionics. They were all great quality and most have kits available without trigger/grip as I usually replace these anyway and it saves some $ buying them without
 
Since I use Geissele triggers, Geissele Maritime bolt catches, Battle Arms Development Ambi Safetys, Strike Industries Enhanced Take Down pins I dont purchase parts kits and haven't for a while. I have bought 20pcs each take down pin springs, detents, etc. from Brownell's and use them when building new lowers. I use JP Silent Capture springs so I dont need a buffer retainer and spring either... I use ERGO grips so dont need grips. I buy the above noted parts from Geissele and Primary Arms when on sale in quantity so I have them on hand.