The TbT Maxi PRO Kit for the 26mm piston HW97/77 gives you everything you need to transform your rifle’s performance in one, cost effective package!

Genuine HW export power spring with fitted guides, short stroke extension, pot of Bum-Slide high moly paste, instructions and sticker all included.

The TbT PRO Kit for the 26mm piston HW97/77 gives you everything you need to transform your rifle’s performance in one, cost effective package! The Pro Kit contains; TbT Drop-in kit, Short-Stroke extension and Bum-Slide lubricant. Incl. 16 J Spring.