This Smith & Wesson 79g looks like it was shot a few times then put away to never be shot again. Even the pellet tins look new. I’ve had two of these before (78 &79g) but they were not in as nice shape. Although, it was the best looking it also required the most cleaning.
The seals were either brittle and hard or gummy. The gummy o-ring were stuck to the brass parts and need to be removed. I scraped it off using a modified brass pick. Then polished with 1000 grit sand paper to remove the stubborn residue. The valve seat was also polished to ensure a tight seal with the poppet.
I used a kit sold by Henry Ford on eBay. The exhaust valve works but isnt as well built as the one Tim (@ MAC1 airguns) used to sell.
The 78/79g is simple pistol to work on. However there can be some parts that are difficult to remove.
Tips for re-seal:
1) To service the co2 end cap you will have to remove a flat head screw that has the piercing pin sticking through the middle so a regular flat head cant be used. If you have a u-fork flathead you’re good to go. If not you can use a small pair off needle nose pliers. The tips may need to be slightly reduced in diameter to fit the screw slot.
2) After removing the hammer spring adjuster and hammer spring guide you will encounter a metal sleeve that is used to hold the gun together. This metal sleeve can sometimes be pried out with a screwdriver but this one was jammed in there. I threaded the sleeve and left the tap in there. Yanked on the tap with channel locks and it pulled the sleeve out.
