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Author Topic: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives  (Read 595 times))

Offline Airgundetectives

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Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« on: October 16, 2021, 10:21:12 PM »
This is a complete review of the Beeman  QB78S Co2 Air Rifle. This is powered by two(2) 12 gram Co2 cartridges.  This comes with a synthetic ambidextrous thumbhole stock.  We will show you the performance! 
#staytunedforairgundetectives​​

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Offline Earl

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Re: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« Reply #1 on: October 17, 2021, 12:53:12 AM »
Good review.
Thank you John.

I would like to REDUCE the muzzle velocity on my QB78S and get more shots per CO2 cartridge.
I would like to get 500 to 550 fps instead of 675 fps.
How can I do that?
  • Lexington, KY, USA
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Offline McNally M.

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Re: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« Reply #2 on: October 20, 2021, 04:56:17 AM »
Another awesome review JC. You made made it abundantly clear that everyone should have one of those QB78S. For the price point and performance, there's no need to second guess!

Thanks again for a great walk through of another great air gun.
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Offline McNally M.

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Re: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« Reply #3 on: October 20, 2021, 05:11:24 AM »
Good review.
Thank you John.

I would like to REDUCE the muzzle velocity on my QB78S and get more shots per CO2 cartridge.
I would like to get 500 to 550 fps instead of 675 fps.
How can I do that?

Earl, I believe this can be achieved by modifying the hammer spring to be shorter, thereby reducing the strength it places behind the hammer. A softer strike of the hammer on the exhaust valve should let out less gas, thereby putting less energy behind the pellet and leaving more CO2 in the reservoir.

Not aware of any "low power" replacements out on the market, but the simple DIY solution is to take the factory spring and trim off a few coils to weaken the strength.
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Offline Earl

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Re: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« Reply #4 on: October 20, 2021, 12:09:19 PM »
Good review.
Thank you John.

I would like to REDUCE the muzzle velocity on my QB78S and get more shots per CO2 cartridge.
I would like to get 500 to 550 fps instead of 675 fps.
How can I do that?

Earl, I believe this can be achieved by modifying the hammer spring to be shorter, thereby reducing the strength it places behind the hammer. A softer strike of the hammer on the exhaust valve should let out less gas, thereby putting less energy behind the pellet and leaving more CO2 in the reservoir.

Not aware of any "low power" replacements out on the market, but the simple DIY solution is to take the factory spring and trim off a few coils to weaken the strength.

That sounds like something I can do.
Is there a video of removing the hammer spring?
Where can I buy a new hammer spring if I mess up the original one?
  • Lexington, KY, USA
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Offline McNally M.

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Re: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« Reply #5 on: October 20, 2021, 06:12:58 PM »
This video does a good job of showing a step-by-step disassembly/reassembly of the QB.



As for replacement springs, AA is a go to source for anything QB related. Here's a link to his hammer kit (spring included). I can't link you to his website, but just do a Google search for "QB78 Hammer Kit" and the first result is your guy, price is $19.99 as of today.
« Last Edit: October 20, 2021, 06:23:48 PM by McNally M. »
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Offline Earl

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Re: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« Reply #6 on: October 20, 2021, 08:23:13 PM »
OK, ^&$@_=s for all QB78 issues.

OPPS !!!
Why can't I put the name of AA on this site??
« Last Edit: October 20, 2021, 08:25:41 PM by Earl »
  • Lexington, KY, USA
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Re: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« Reply #7 on: October 20, 2021, 08:47:48 PM »
OK, ^&$@_=s for all QB78 issues.

OPPS !!!
Why can't I put the name of AA on this site??

There is some history behind that in a negative way so his name was added to the filter list.
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Offline whtsmoke

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Re: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« Reply #8 on: October 23, 2021, 12:30:34 AM »
I checked around after the video to see what the prices were like and found that of all people Amazon had the best price so I thought why not and I ordered the 22 caliber version of the rifle. I got it delivered yesterday and mounted a scope on it after I cleaned the rifle good and was pleased with the results. I have tried six different pellets in it and so far the 16 grain Poly Mags are the most accurate followed by the JSB 14.35's and the JSB 15.88's. The H&N Baracuda 18's also do pretty good but I kept getting one flyer and I know it was me so i will test them some more. I almost want to order the .177 now.
Very good review JC as always.
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Offline Earl

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Re: Beeman QB78S Co2 Air Rifle "Full Review" by Airgun Detectives
« Reply #9 on: October 23, 2021, 05:09:24 PM »
I checked around after the video to see what the prices were like and found that of all people Amazon had the best price so I thought why not and I ordered the 22 caliber version of the rifle. I got it delivered yesterday and mounted a scope on it after I cleaned the rifle good and was pleased with the results. I have tried six different pellets in it and so far the 16 grain Poly Mags are the most accurate followed by the JSB 14.35's and the JSB 15.88's. The H&N Baracuda 18's also do pretty good but I kept getting one flyer and I know it was me so i will test them some more. I almost want to order the .177 now.
Very good review JC as always.

You might want to try the QB78D in .177.
I like my QB78D in .177 better than my QB78S in .177.
https://www.amazon.com/Beeman-QB78-177-Air-Guns-Rifles/dp/B01J8Q4NOA/ref=sr_1_4?dchild=1&keywords=qb78d&qid=163
« Last Edit: October 23, 2021, 05:12:45 PM by Earl »
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Benjamin Marauder .177, Crosman Challenger .177, Umarex Gauntlet .177, Benjamin Discovery .177, Benjamin Maximus .177, Gamo Whisper Fusion .22, Crosman 2100B, Crosman 2300T, Browning Leverage .177, 2-CMP Daisy 853s, Daisy 880, Mrodair CP-1M .177, Mrodair CP2 .177, 10-Beeman P17s, 3-Crosman P1377s, Umarex Fusion .177, GameFace M4A1 airsoft, Crosman Vigilante, Umarex Peacemaker, 5-Bug-A-Salt, plus many others