Hot Rod QB78

Hot Rod QB78

Joined: August 10th, 2007, 5:51 am

September 24th, 2016, 2:48 am #1

Hey airgunning brothers!

I have been working on a little project over the past few weeks and it's close enough to done to be able to share it with you all.

Let me start by saying that I wanted something a little "different" than the traditional airgun/gun look meaning, the color brown! Ha ha ha!

This rifle is .22 caliber and started out as a stock QB78 using two 12 gram CO2 cartridges to propel the pellet. I'm not a very good note taker so I can't recall what it shot in stock form but that doesn't matter because it wasn't long after first receiving it, I opened it up and started to get more from it. Not huge power but a moderate increase with simple modifications to increase performance.

I had it in this modified stock state for a while and enjoyed it but I really enjoy spring guns so it didn't see much action especially having to use the CO2 carts all the time. I recently decided to convert it over to HPA with a bottle. After some internet research and questions asked and answered, I started into the project.

Converting to air required some modifications to the action and the stock and after some internet inspiration, this is what came out of the fire. I still have tuning to do to it to get the most out of it but I can go,out and enjoy shooting it and having something unique of my own creating!

It shoots 15.9 gr JSB at 745 fps average for about 19.5 fpe. I'm only getting about 40 shots per fill so I need to work on the efficiency but it's still fun.




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Joined: February 5th, 2014, 8:05 pm

September 24th, 2016, 3:56 pm #2

Sure not your typical looking rifle now Brett. Great job. I'm guessing you'll be getting more requests from the kids to help pretty up their gun now.

That's a good bit of power too! Almost 20 fpe.

I liked the pics on the yellow showing the stock mods. I'm sure it would be of interest to many here.

Thanks for posting the pics!

Last edited by BEnoch on September 24th, 2016, 3:56 pm, edited 1 time in total.
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Joined: November 6th, 2012, 6:22 pm

September 24th, 2016, 6:58 pm #3

Got to say that stock is different. Looks very good.
I'm sure that conversion from the cartage to HPA took some work.

Many are enjoying the QB modded to real air.

Check out my latest on the PCP page if you get the chance.

Another great Job and great share.
""
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Joined: July 12th, 2012, 12:44 am

September 24th, 2016, 8:54 pm #4

Hey airgunning brothers!

I have been working on a little project over the past few weeks and it's close enough to done to be able to share it with you all.

Let me start by saying that I wanted something a little "different" than the traditional airgun/gun look meaning, the color brown! Ha ha ha!

This rifle is .22 caliber and started out as a stock QB78 using two 12 gram CO2 cartridges to propel the pellet. I'm not a very good note taker so I can't recall what it shot in stock form but that doesn't matter because it wasn't long after first receiving it, I opened it up and started to get more from it. Not huge power but a moderate increase with simple modifications to increase performance.

I had it in this modified stock state for a while and enjoyed it but I really enjoy spring guns so it didn't see much action especially having to use the CO2 carts all the time. I recently decided to convert it over to HPA with a bottle. After some internet research and questions asked and answered, I started into the project.

Converting to air required some modifications to the action and the stock and after some internet inspiration, this is what came out of the fire. I still have tuning to do to it to get the most out of it but I can go,out and enjoy shooting it and having something unique of my own creating!

It shoots 15.9 gr JSB at 745 fps average for about 19.5 fpe. I'm only getting about 40 shots per fill so I need to work on the efficiency but it's still fun.



great details on the stock...looks like a custom benchrest stock (which it is
custom since you made it). Shooting pretty strong too, what do you use to fill the
bottle with?

You do good work Brett.

Regards, Thomas M.
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Joined: October 23rd, 2011, 7:34 am

September 26th, 2016, 2:03 am #5

Hey airgunning brothers!

I have been working on a little project over the past few weeks and it's close enough to done to be able to share it with you all.

Let me start by saying that I wanted something a little "different" than the traditional airgun/gun look meaning, the color brown! Ha ha ha!

This rifle is .22 caliber and started out as a stock QB78 using two 12 gram CO2 cartridges to propel the pellet. I'm not a very good note taker so I can't recall what it shot in stock form but that doesn't matter because it wasn't long after first receiving it, I opened it up and started to get more from it. Not huge power but a moderate increase with simple modifications to increase performance.

I had it in this modified stock state for a while and enjoyed it but I really enjoy spring guns so it didn't see much action especially having to use the CO2 carts all the time. I recently decided to convert it over to HPA with a bottle. After some internet research and questions asked and answered, I started into the project.

Converting to air required some modifications to the action and the stock and after some internet inspiration, this is what came out of the fire. I still have tuning to do to it to get the most out of it but I can go,out and enjoy shooting it and having something unique of my own creating!

It shoots 15.9 gr JSB at 745 fps average for about 19.5 fpe. I'm only getting about 40 shots per fill so I need to work on the efficiency but it's still fun.



That looks really cool lol nt
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Joined: August 10th, 2007, 5:51 am

September 27th, 2016, 1:34 am #6

Hey airgunning brothers!

I have been working on a little project over the past few weeks and it's close enough to done to be able to share it with you all.

Let me start by saying that I wanted something a little "different" than the traditional airgun/gun look meaning, the color brown! Ha ha ha!

This rifle is .22 caliber and started out as a stock QB78 using two 12 gram CO2 cartridges to propel the pellet. I'm not a very good note taker so I can't recall what it shot in stock form but that doesn't matter because it wasn't long after first receiving it, I opened it up and started to get more from it. Not huge power but a moderate increase with simple modifications to increase performance.

I had it in this modified stock state for a while and enjoyed it but I really enjoy spring guns so it didn't see much action especially having to use the CO2 carts all the time. I recently decided to convert it over to HPA with a bottle. After some internet research and questions asked and answered, I started into the project.

Converting to air required some modifications to the action and the stock and after some internet inspiration, this is what came out of the fire. I still have tuning to do to it to get the most out of it but I can go,out and enjoy shooting it and having something unique of my own creating!

It shoots 15.9 gr JSB at 745 fps average for about 19.5 fpe. I'm only getting about 40 shots per fill so I need to work on the efficiency but it's still fun.



I am still playing with spring and hammer settings to dial it in. I'm thinking 750 fps is max for the 850 psi regulator pressure. I really need to figure how to get rid of hammer bounce! That is the wasting of air, I am pretty sure of that. Maybe a higher reg setting will help some with that or possibly more spring in the valve? Just thinking here. I know that the higher reg pressure will increase the fps output so maybe that might be a good thing to try soon.

Thanks for the kind words!
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Joined: August 10th, 2007, 5:51 am

September 27th, 2016, 1:36 am #7

Sure not your typical looking rifle now Brett. Great job. I'm guessing you'll be getting more requests from the kids to help pretty up their gun now.

That's a good bit of power too! Almost 20 fpe.

I liked the pics on the yellow showing the stock mods. I'm sure it would be of interest to many here.

Thanks for posting the pics!
That I modified. Here are some progress pics to see kinda how it went. I was inspired by benchrest rifles for this look.
















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Joined: July 12th, 2012, 12:44 am

September 27th, 2016, 2:15 am #8

I am still playing with spring and hammer settings to dial it in. I'm thinking 750 fps is max for the 850 psi regulator pressure. I really need to figure how to get rid of hammer bounce! That is the wasting of air, I am pretty sure of that. Maybe a higher reg setting will help some with that or possibly more spring in the valve? Just thinking here. I know that the higher reg pressure will increase the fps output so maybe that might be a good thing to try soon.

Thanks for the kind words!
good luck on that Brett...LOL, but how about a heavier hammer and spring?

Regards, Thomas M.
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Joined: November 6th, 2012, 6:22 pm

September 27th, 2016, 2:23 am #9

I am still playing with spring and hammer settings to dial it in. I'm thinking 750 fps is max for the 850 psi regulator pressure. I really need to figure how to get rid of hammer bounce! That is the wasting of air, I am pretty sure of that. Maybe a higher reg setting will help some with that or possibly more spring in the valve? Just thinking here. I know that the higher reg pressure will increase the fps output so maybe that might be a good thing to try soon.

Thanks for the kind words!
How much striker do you have adjusted in the gun. 120 bar might be where you want the regulator set at. 1750 psi may be much for your set up.

Most if my regulated are set at 120 bar. That is .20 up to .357. Marauder .177 is set up around 130 bar.

Then there is always transfer port sizes and hammer weight to concider?

Pcp is fun and pcp has many adjustments that can be done.
""
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Joined: August 10th, 2007, 5:51 am

October 3rd, 2016, 6:05 am #10

great details on the stock...looks like a custom benchrest stock (which it is
custom since you made it). Shooting pretty strong too, what do you use to fill the
bottle with?

You do good work Brett.

Regards, Thomas M.
I use a PCP pump to fill the tank. I fill it to 3000 psi and now that I have tweaked on the rifle some, I am getting about 80 shots! Huge improvement over the initial set up. Pumping isn't that bad, don't let'em fool ya!
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