The gas is most likely to vent downwards, through the magazine channel and magazine. Some will travel down the rails, but the majority of it leaves through the biggest holes available.
The GunGrips will not shatter, but the screws/frame bushings holding them on may shear out depending on the force of the KB. This could cause the grips to separate from the weapon, but there would be no dangerous fragmentation as found in lesser grips.
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