Vortek HW97/77 PG4 Steel Tune Kit, 12ft/lb

We Highly recommend the install of our VacSEAL25 or 26 with the new PG4 STEEL for best damping shot cycle. (12FT/LB) For HW77 smaller compression tube Seal size, please go to bottom of page The redesigned PRO-GUIDE4 STEEL weighted tune kit having a STEEL Body, + 2 Performance: High Output (12FT/LB) Power up to 12ft/lbs Content: (PG4) ProGuide4-STEEL drop-in Kit High Yield valve wire open-end power spring Triple guides with Helical Lubrication for damping of metal, plastic and seals (OPTIONAL: Vortek Vac-SEAL26) Installation: For Consideration when tuning power: It is the owner's responsibility to ensure legality of their air gun power output. Works will all HW trigger arrangements OPTIONAL: NOTE for legal limit: Vortek's VacSEAL 25 or 26 piston seal is not required for air rifle to shoot when PG4 is installed. Vortek's Location of testing is 578 Feet.Above.Sea.Level. TUNE APPLICATION: NEW PG4 STEEL Tune-Kit fitting HW97 Air Rifles QUAD-4 guides for best stability upon firing! (F.A.S.L) For every 1000ft above or below will be approximately .029 difference in velocity, thus foot-pound (Ft/lb, Joules) of shooting energy. OPTIONAL PISTON SEAL: Special Note for OLDER HW/77 air rifles having smaller compression chambers - your HW77 airgun serial# before 1446049 has an 25mm Compression Tube Bore!! 1000 F.A.S.L.x .029 = 29fps approx Joules= .7475=ft/lb Easy, do-it-yourself with virtually no pre-load force on assembly. Choose 25mm VacSEAL.

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Vortek HW97/77 PG4 Steel Tune Kit, 12ft/lb