CDNN are good folks. But, understand, they are liquidators. They buy surplus, over runs, ans overstock merchandise.
Magpul is tops in plastic mags. Milspec is what to look for in GI mags (D&H is the current best deal on GI mags, followed by Brownell’s).
If you want plastic, stay with Magpul. GI? go with D&H.
BTW, PSA offers both.
Along the line of liquidation, Para Ordnance is gone, absorbed by a conglomerate. CDNN has a bunch of their liquidated guns, some at very good prices (some prices so/so).
If you are wanting a 1911 pattern gun, take a look at what they have.