Caption: For added strength for those magnums, it features a ball-detent locking point
That seals the locking point
for SIG's precise-fitting optional aiming laser.
I have been hassled by TSA demanding I lock every locking point
on the case.
That same "locking point
in the hollow of the palm" effect is shared with "baby Glocks" (one reason the G26 has been known to beat full-size G17's for overall championships in Glock matches).
In fact, you can actually safely eliminate one of these locking points
and substitute a locking point
that adds absolutely no friction to the cycling of the gun.
The ejector rod serves only to activate the ejector, not as the front locking point
for the cylinder.
The third locking point
was between the yoke and the massive extractor shroud.
Try finding a more solid locking point
slightly inside your knees and just behind your elbows.
Two things distinguished the Triple Lock: the additional locking point
in the yoke and a shroud that completely enclosed the ejector rod.
As Addex explains, this transforms the previous low-velocity lower lip into a high-velocity air stream, creating two primary locking points
instead of just one, to significantly improve bubble stability.