ChrisWell hate you had to sell it but then glad you got it on its way back as well so it apparently all worked out for the best.Mike
ChrisYea I am just on my first QB build and hoping it will turn out as good as all the reports I have read here about them. Got my bolt probe and valve all done modding and working on the cock on open, RVA and tank block mods to be completed and ready for tuning.I started with a QB 78 and am going for a 177 caliber FT gun shooting 10.34s JSBs at 900 fps so I can shoot an entire match plus sight in on one fill.Then I will go after the power house mods if this one turn out as expected. I have a Flying dragon PCP in 22 just begging for the 30 fpe mod with a tank installed to up her shot count over the 30 I get now filling to 2000 psi and shooting JSB 15,89 at 860 up to 900 and back to 860 for 30 shots at 28.89 fpe now but only for about 5 shots on the knee of the curve so only needs a little valve work and the regulated bottle to get the 30 fpe with double the shot count for a nice hunting gun as it is a tack driver now as is just to big a ES for consistent POIs.Mike
ChrisThat sounds good as I have a pro SHP reg already set at 1100 psi output. I have opened up the probe to .140" for the port hole and .125" for the probe passage hole and cut away the valve nose with two 3/8" slots down the sides and a 3/8" center hole where the piercing pin was, also replaced the poppet head with and older crosman 2240 brass head that is stepped and uses a delrin seat on the valve seal area and opened up the throat to 9/64' with the valve port angled and rounded.Next is the cock on open mod and installing the tank block and RVA screw hole but may go with a crosman end cap so I can keep the adjustment screw centered instead of off set. since I have several end caps on hand.Mike
ChrisI like the 2078 stock cut away to fit the 79 action and tank block as I have thought about getting the target stock for my 78 with the tube shortened slightly so its good to see it can be just cut to clear the tank and block. I like the olive drab green paint as well and is it just paint or colored bedliner.I just got the 79 I traded the disco I got from you yesterday and have shot it some and very happy with it and just need to tune it for a bit more velocity as its shooting 10.34s at 790 fps and I want another 100 fps so going to see how many shims under the hammer spring it has since it has the cock on open mod done and if cannot add any to the hammer spring I will up the tank pressure by 100 psi.Which do you think is the best route to go add spring tension or output pressure to gain 100 fps over what it shoots now.Mike
Quote from: buldawg76 on March 28, 2016, 02:39:52 AMChrisI like the 2078 stock cut away to fit the 79 action and tank block as I have thought about getting the target stock for my 78 with the tube shortened slightly so its good to see it can be just cut to clear the tank and block. I like the olive drab green paint as well and is it just paint or colored bedliner.I just got the 79 I traded the disco I got from you yesterday and have shot it some and very happy with it and just need to tune it for a bit more velocity as its shooting 10.34s at 790 fps and I want another 100 fps so going to see how many shims under the hammer spring it has since it has the cock on open mod done and if cannot add any to the hammer spring I will up the tank pressure by 100 psi.Which do you think is the best route to go add spring tension or output pressure to gain 100 fps over what it shoots now.MikeIt's just Krylon camo paint. Two coats of primer, two coats of paint, and I'm still working on the satin polyurethane coats. I just threw it in the stock for a pic. I'm assuming the 79 is regulated? If it has a power adjuster on the back, I'd screw it in all the way and see what type of speed you can get. If it doesn't and is running the Ninja SHP tank @ 1100 psi, bumping it to 1450-1500 should get you the fps you're looking for. Playing with the hammer spring is ideal though. You want the lowest regulator set point possible for the fps you want. That way you are getting the most shots possible. Ideally, you want the gun to max out at 15-20 fps higher than you want with the power adjuster screwed in all the way. That way, the fps you are going for is on the knee.