Click to expand Tap to zoom KWA E-10 Hop Up Bucking by KWA Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $17.99 SKU 199-9999-E010-NS2 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart The KWA E-10 bucking fits most KWA pistols and some SMGs. Occasional replacement will help restore accuracy and prevent jamming. Ball bearing, when needed, is sold separately.