Wilson Mag Problems
Howdy Edward,
Inertia is causing the problem, and a heavier spring can be a possible
fix. The problem with 8-round magazines is that the extra room has to
come from somewhere, and since there ain't no such thing as a free
lunch, the number of coils on the spring have to be reduced...which
provides less tension on the follower when the magazine gets low
on ammo.
The Wilson-Rogers follower can add to the problem because they
are slippery, and they don't have a dimple to recapture the round as
it slips forward while the spring is fighting to overcome the inertial
mass of the round.
As quickly as possible, here are the mechanics of the event.
The pistol fires, and torques upward and backward in recoil. The
weight of the last round causes the magazine spring to be compressed
ever so slightly, and the round "floats" for an instant. Before the
spring can overcome this and nail the round to the feed lips, the
slide smacks the frame and jerks the pistol backward sharply while
the cartridge obeys the law of motion...and stands still while the
gun...and the magazine move away from it. All this happens so
quickly that we don't feel the two separate impulses, but they are
there.
The round escapes the feed lips before the slide stop notch can get
past the slide stop, and the slide locks with the round laying loosely on top.
In some circumstances, the live round can be kicked out of the
ejection port as the slide locks.
8-round magazines are a deviation from the original design, and as
with any deviation, something else suffers. The engineering dictum
applies:
"Whenever something is changed, three more changes usually have to
be made to compensate for it."
Hope this explains it.
Tuner