Click to expand Tap to zoom KWA TK.45 Hop-Up Chamber Unit by KWA Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $44.99 SKU 199-1605-4001S 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart This polymer hop-up assembly fits all TK.45/TK.45c series. Features High quality reinforced polymer construction Rotary style adjustment knob Factory direct OEM replacement part