I've heard the same thing as Jerry said too, almost word for word. The jury is still out for me though, I'll keep listening for more substantial and methodical tests before deciding, for or against. With the recent "positive" posts here on them, I'm even more confused now.
I'd be convinced if 100 rounds were fired in each of six different rifles with the Speedlock pin and 100 round in each with the standard pin in them, three would be M70's and three 700's. Only changing that component and shooting all 1200 rounds in the same day with the same shooter and conditions too. You think I'm asking too much?