Hi to everyone,
This is long outstanding, so I recently registered on the site to add my 2 cents and experiance with the QB79. I do not like computers and donít have any trust in my computer skills (tegnologies gestremd) to be able to post correctly. So here goes.
My introduction to the QB79 was about four and a half years ago, shooting with a little co2 air rifle my father had purchased from their local gun shop for plinking on his smallholding. He enjoyed the shot count and accuracy. For me the QB lacked power but it was VERY accurate. We could shoot the lids off 2 litre cooldrink bottles at 20m with open sites. That was just amazing to me because I had a Gamo Hunter 440 at that stage that could not get 60mm groups at that distance. Partly due to my own inabilities, but mostly the rifle was very inconsistent. Had a MZE trigger and gas ram fitted to the Gamo, now it is much better but not even close to the QB in my hands.
When I got back home I started doing research on the QB79 and found Subsilent Suppressors on the net, this guy had done hpa conversions to many QBís and he had a link to Charliedatuna who has a whole walkthrough to service, tune and upgrade the rifle, that I downloaded immediately.
And so started my search to get my own QB79. My father joined in and we tried all the places we new who sold air rifles but could not find any. Eventually he found one in his hometown that was in pieces, the owner had stripped it and could not get it reassembled. Everything was rusted and the stock was scratched and full of dents. A swap for a couple unused items was made and the rifle eventually made its way to me in a 5L ice cream container. Luckily after reading on many more sites overseas and on Airrifle.co.za I was confident that I could get the QB79 back to original and even better than before.
After countless hours of grinding, sanding, deburring and polishing, and working on the valve, valve stem and tank block, things started looking much better. At that stage I did not have a lathe so everything was done with a drill press, a die grinder and elbow grease (lots off). And reading and reading and reading. I got rid of most of the aluminium part of the valve that holds the o-ring seal in place to get more volume and replaced the stock valve spring with an over the counter 8mm x 40mm (i think) spring from a small local hardware store. The tank block was drilled to accommodate the new spring and the brass part on the valve stem reshaped on the drill press to fit the new spring. I used the die grinder to open the ports from the valve to the barrel and used irrigation pipe as transfer port. All the o-rings were replaced with what I could find at a hydraulics shop, I did not know of The Paintball shop in Centurion at that time. The hammer spring is still original.
The rifle would leak a lot shooting with co2, and I was still looking for a place that sold a hpa tank that would fit under the barrel without touching. I eventually heard of The Paintball shop and met Hardy who was very helpful with advice and a replacement bolt handle that the previous owner had lost. They also sell an o-ring kit for the QB79. Not long after, I heard that Hardy had relocated somewhere overseas if I am correct. He has a lot of knowledge about these air rifles and I wish I had known about the Paintball shop earlier. Imho they have lost a lot in the air rifle market because of Hardy leaving. I bought a hpa tank with a 1400 psi regulator and re-fitted everything again.
The first test with hpa was at Archers Edge in Wekker street using their chronograph. I was very impressed, between 19 and 22 fpe with JSB 10.34gr and 13.43gr pellets. Accuracy was ok using a bantam scope I had used on the Gamo, 30mm groups at 25m. I got myself a Nikko Stirling Nighteater 6-24x44 from Nextfield, the best I could afford at the time. Not a bad scope for the price but definitely not the best you could buy. But now a can shoot paintballs at 45m and more with ease and if I miss, it is all my fault. For a little 4.5mm this rifle is very powerful and accurate at the same time.
Now it was so loud I had to fit a silencer and did not want a slip op. My father had a lathe we bought jointly that I had no use for at the time, but it can not cut thread. He has another solution to thread a barrel that I did not want to do. I wanted a professionally threaded barrel, so I had it done Ďprofessionallyí but the fit was a bit loose. I could live with it seeing as I did not want to cut the barrel to redo it.
Now I turned my attention to the stock, seeing as I am not good with wood I left that project till last. I really did not know what to do with the wood, so I started sanding the stock to get rid of all the damage. After seeing the stock in the original wood colour I wanted it to be as natural looking as I could get it, so I used a light coat of Tru-oil gunstock finish, and for finishing, a wax and oil mix my father had given me for my Gamoís stock. Most people would probably not like the lighter stock, but to me it looks better than the original.
Recently I took over the lathe and I decided to redo the thread the way my father does it. Take a Ĺ inch unf bolt, drill a 9mm hole through the center, turn the barrel to 9mm to fit the bolt, cut the bolt to the right length of the cut barrel, solder the threaded bolt to the barrel using rosin solder. Finnish on lathe without damaging the crown and bobs your uncle. Most people would not even notice that it is a soldered piece. This rifle I would not blue because I have become so used to it, I am going to leave it as is.
Now I can make my own silencers and test with different sizes. I use grub screws to fit the end caps to the tubes seeing as I can not cut thread with my lathe.
My QB79 and a recently purchased Spa Predator pr900w 5.5mm
I would not let my QB go for anything less than financial reasons and if I had the means I would have ten or more in different states of tuning and calibres.
Thank you for advice given, knowing and unknowing, to me from all the sites and people I have spoken to in the last couple of years.
E hoop hierdie kan ok as inspirasie dien vir ander met dieslefde QB geweertjies en dat ek nie te lank in die tand was met my storie nie
Danie (Man with no name)