re: Looking to buy an AR 10

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If BCA and Aero are compatible but BCA and PSA have slop, stands to reason Aero and PSA also have slop.

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I have not handled a BCA Upper on a PSA Lower to compare, but I did have a BCA Upper on an Aero Lower. There was a little slop but not bad for a $550-$650 pile of parts (purchased everything in November on sale).

In January I stumbled across a Aero M5 Stripped Upper on sale ($95-ish). That mitigated the slop but using the BCA handguard I noticed the profile difference.

So now shopping for a new handguard but out of boredom, also looking for a new 18"-20" barrel.

Also now have a stripped BCA Upper laying around if anyone was starting a project. (will have the BCA barrel and handguard back on it when I purchase new ones)