A coil-tubing ram blowout preventer is disclosed that includes a ram block and ram-block cavity each having a D-shaped cross section. The flat portion of the ram block's “D” corresponds to the flat portion of the cavity's “D” to prevent rotation of the ram block within the ram-block cavity. The ram block may be configured with selectively replaceable seals, slips, or shear blades to allow easy configuration of the ram block for various sizes of tubing. The shear blades may include a sealing component on one surface of the blade such that paired shear-ram-blocks may create two distinct sealing points when each sealing component engages the other blade when the shear rams are closed.
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