AR rifle/pistol kits

[Vierings]

Besides PSA, where do folks find kits to build a pistol or rifle from the ground up? I have my lower. And I'd like to find a low(er) cost 1 or 2 stop option that I can put together a rifle or pistol in 5.56. Many people I talk to keep warning me against PSA. I could do a complete upper and LPK. I just really know nothing.
Searches have led me most often to PSA, a series of online stores to buy bits and pieces. Or more costly complete units.
Any suggestions out there?

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[Tony617]

I buy some stuff at Primary Arms.

AR-15 & AK-47 Parts & Accessories | Primary Arms

 

[Unka-Boo]

Primary Arms
Brownells
Midway
Del-Ton
Model 1 Sales
AR15 Sport
CDNN
Classic Firearms

what I could think of off the top of my head....that said, I have had ZERO issues with PSA builds.