We've asked Mike Eagleshield about converting non-decocker guns to decocker, and vice versa. For guns that have the same size frames -- and the guns we're talking about have versions with decockers that have the same frames -- its apparently possible. But very expensive. The parts are expensive, and the gunsmith labor would be expensive, too.
To do this with another model, recently, Mike quoted a price of about $300...
I don't like decockers much, and I SURE don't like'em enough to pay almost the price of the gun to upgrade / or downgrade...
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With regard to colored followers.
Red is a bad color for those who are color blind, and it sure wouldn't show up well in low-light conditions, even if you weren't color-blind.
And, if I had a slide lock back, and I had already fired several rounds, I'd be doing a slide-lock reload in the kind of situation described. If there was any question about rounds remaining, I'd hang onto the prior mag.
If I had fired only one or two rounds, I'd "slingshot" or release the slide and try to continue. (Its not a jam, but a TAP RACK BANG drill would also work.)
I would think that SPEED is critical in such a situation -- staying engaged -- and it would seemt that looking inside the lockwork is not a good thing to do.
Tracers?
Are you serious?
If you could find them, you'd probably also find that 1) they're not good self-defense rounds, 2) they may be fire hazards if they function as tracers, and 3) they may or may not function well in your weapon.
They won't even work up close and personal, where most of handgun action takes place.
An extra mag and practice changing the mags makes a lot more sense than anything you've described.