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

TUNE APPLICATION: NEW PG4 STEEL Tune-Kit fitting HW97 Air Rifles QUAD-4 guides for best stability upon firing! (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. Vortek's Location of testing is 578 Feet.Above.Sea.Level. (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. 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. 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!! Choose 25mm VacSEAL. We Highly recommend the install of our VacSEAL25 or 26 with the new PG4 STEEL for best damping shot cycle. 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.