Early and later Colt SP1 Sporter magazine

[RCS]

I once found an AR-15 magazine on a three digit Colt SP1 Sporter that had the small letters and numbers CAL. .223 and have never seen another since - until someone posted a photo of the same magazine (with four holes in the side - cartridge counter ?) on another forum.

The enclosed photo will show the difference in the CAL. .223 marking between the early and later magazine. Anyone have some of these early magazines ?Attachment 23717

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