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The M14 originally had a wooden handguard, but they found that it charred during rapid and full auto fire. Next came a slotted fiberglass handgaurd. They found that it was a bit on the brittle side and that the slots allowed heat mirage over the barrel once it heated up from rapid fire and full auto fire. The most common handguard is the solid fiberglass handguarrd that they develeoped to resist charring and to prevent heat mirage and be a bit sturdier than the slotted ones.
