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https://www.quora.com/How-much-control-do-soldiers-have-over-the-customization-of-their-weapon-Do-they-get-to-pick-the-sights-whether-ACOG-red-dot-or-iron-sights-What-type-of-grip-they-use-Maybe-even-an-under-attachment-or-adjustable-stock/answer/Chris-Everett?srid=oJZd