Horizon Hobby
HPI NITRO Star 21bb Engine Cover Plate (HPI1431)
This is the Cover plate for the .21 BB engine by HPI.
Machined aluminum back plate
One back plate
HPI .21 BB (HPIG1401)
Length: 31.7 mm (1.24") Width: 39.8 mm (1.568") Height: 14.7 mm (0.578")
This is commonly known as an adapter plate because it's used with a recoil.
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