Both have advantages. Converting or building you can use any parts you want or simply convert an existing upper. Buying a complete Adams you get their melonite barrels, custom Mega built receivers that don't need the bushing for the op rod, and warranty on the complete upper. They use Samson handguards on various models which are really nice and you get a pinned block.
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Pretty much every piston action uses a return spring. Piston AR designers are working the AR platform. And for a long time and it's not changing ever more than likely, AR users prefer as many common parts as possible. Other manufacturers have made piston AR uppers with a upper return spring and they've pretty much been a flop. There absolutely nothing wrong with using the buffer spring as the return and keeping parts as standard as can be in number. I prefer it myself. I use Superior Shooting's chrome silicon buffer spring in mine at present and likely for a very long time since they are rated to about 500,000 compressions. More rounds than I'll ever shoot in my lifetime I've no doubt. I also use a heavy stainless buffer too that reduces recoil, but used a regular carbine buffer and spring for a long time and with all my previous piston AR's.
Rock River would appreciate the business if you're interested though.
If I wanted a rifle with an upper return spring though, I'd probably just buy a SIG 556, SCAR or ACR.Rock River Arms: LAR-PDS Carbine
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