Slant Pros and Straight 8's are the same sight. The Straight 8's are nothing more than Slant Pro's with 2 tritium inserts.
Heinie's older sights (pre Slant Pro), offered a simular sight picture, but the rear sight was not slanted like the newer version and didn't give as large of a sight picture as the newer Slant Pro's.
Are you possibly comparing the older Heinie's to the newer Slant Pro / Straight 8's?
Semper Fi,
Jeff
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