The two big advantages to the Wilson magazines seem to be their close adherence to specs and their solid synthetic follower design.
The split-follower as found on many magazines, including Chip's Power Mags can be tilted forward or pushed forward when the slide comes down on a full magazine. If pushed forward, the lower steel "lip" can protrude and gall an alloy frame right at the feed ramp area. Wilson eliminated this with their synthetic follower and it won't move forward or tilt like the other types.
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BillCA in CA (Unfortunately)
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