You said it yourself, an FSB is solid and simple. It's still by far the most sturdy gasblock you will ever have, shaved or unshaved. That said, a lowpro can be pinned as well. I say it boils down to personal preference and requirement. In your case, I know this is "your wife's" AR but what other AR's do you have? I would configure it to both suit her needs as well as supplement what you already have. Without knowing what you have, going by the idea of light and simple for your wife alone, I would get the Colt. Simple/basic, light, with a 16" barrel, so you can easily reconfigure it to suit her eventual needs and preferences, or even yours.

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