| Type | BL&P |
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| Projectile | steel, brass fuze, dark green, 1 copper driving band Projectile Markings: (stamped on fuze) MK 26-1 R R (stamped on projectile) LM LOT 661 MK 2 |
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| Case | brass, segmented crimp Markings: (black ink) ZG 30 McA 51 |
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| Primer | percussion, flat, brass, ring crimp, red annulus |
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| Headstamp | A.S.C. 1944 20MM-MK-4 |
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| Notes | BL&P stands for Blind Loaded and Plugged (in other words, target practice). This is indicated by the dark green projectile and the "ZG" designation stenciled on the case. Blind Loaded means an HE projectile loaded with an inert filler, and plugged indicates a lack of tracer. |
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