BRK Ghost Review

[Franklink]

20+ dry fires till it went from 400 psi to 0, did not vent to do that, did not vent when bottle attached
Max 1460/927, 1455/924
Min 1419/927, 1445/927

So that's roughly 100 bar, and hardly any difference in fps with the wheel on max or min. Which is what you've been saying.

It's almost acting over sprung (for a .177), which has got me wondering if you ended up with the heavier, 0.052" wire hammer spring in there. You game to take it out and measure?

 

[tec]

So far i have shot it at reg pressures 57, 65, 69, 83, 100, 147, 150, 156 barg and saw no significant change in ft/s from Min to Max.
I will set back up and shoot at 115 bar 1667 psig

 

[tec]

So that's roughly 100 bar, and hardly any difference in fps with the wheel on max or min. Which is what you've been saying.

It's almost acting over sprung (for a .177), which has got me wondering if you ended up with the heavier, 0.052" wire hammer spring in there. You game to take it out and measure?

1/2 my brain says hell yeah…the other half is saying dude you just scrimped and saved and cashed in all ur chits with the boss and this brand spanking new $2100 rifle aint working out of the box…send it back

 

[cavedweller]

Will go through reg lower procedure and post 100 bar. FYI i posted this in a diff group, but the two times i have done this i get down to ~80psi and the rifle vents to 0, then when i attach bottle it vents until i cock (quickly) it

Do tell more! I should be getting my Ghost back from AOA this week and hope my mysterious degassing / valve stem leak has been resolved

 

[tec]

So that's roughly 100 bar, and hardly any difference in fps with the wheel on max or min. Which is what you've been saying.

It's almost acting over sprung (for a .177), which has got me wondering if you ended up with the heavier, 0.052" wire hammer spring in there. You game to take it out and measure?

 

[tec]

Dimensions

 

[Franklink]

1.36 millimeters =
0.0535 inch

So, yep, you got the Heavy hammer spring.

Call AOA and ask for the 0.047" wire spring. The "medium" spring should give you just as much or close to as much fps on the upper end, but also also lower fps with reduced hammer tension (with an optimal reg setting).

I've got a 0.052 wire spring. The difference in 0.052 and 0.053 is likely in the calipers we're using, probably the same spring. But anyway, even for 50fpe in .22 I didnt need the 0.052" wire spring.

Or source yourself a lighter spring at a hardware store. I've played around with various lengths and decided that keeping it close to the 2 inches OEM spring length gives the best combination of how it feels to cock and the efficiency. So keep it about 2 inches in overall length, and roughly the same outer diameter and it'll work. Take your spring and the wheel if you decide to do the hardware store. Use the spring guide on the wheel to make sure inner diameter is good, and compare length and OD to the spring your gun came with.

 

[tec]

Ok will do. Thank you again.
So, i dont understand, why would they put a spring in the gun that doesnt enable the power wheel? And why didn’t BRK function ck the rifle before leaving the factory? My Revere was ck, with velocity and power recorded…

 

[Franklink]

Ok will do. Thank you again.
So, i dont understand, why would they put a spring in the gun that doesnt enable the power wheel? And why didn’t BRK function ck the rifle before leaving the factory? My Revere was ck, with velocity and power recorded…

I'm not sure if the HP in .177 is supposed to have the 0.052 or the 0.047" wire hammer spring.

A guy wanting to launch 20 grain .177 slugs would probably prefer the spring you got in your gun.

I do know that from what you have described, youve got more spring than you need for your desired uses.

 

[tec]

Also, minimal resistance on going from min to max…is that right?

 

[Franklink]

Also, minimal resistance on going from min to max…is that right?

Yes, the increase in resistance from min to max is pretty minimal. Perceptible, but minimal.

 

[tec]

I'm not sure if the HP in .177 is supposed to have the 0.052 or the 0.047" wire hammer spring.

A guy wanting to launch 20 grain .177 slugs would probably prefer the spring you got in your gun.

I do know that from what you have described, youve got more spring than you need for your desired uses.

Why? The power wheel isnt doing anything?

 

[Franklink]

Why? The power wheel isnt doing anything?

If a guy wanted the most fpe he can get from the heaviest projectiles he wouldn't need the wheel, just max energy to the valve each time (hammer impact, driven by hammer spring).

Just cuz the wheel is there, doesn't mean you have to use it.

There's some Facebook groups with lots of English Airgunners. By law they're restricted to 12fpe. They can't adjust the regulator-tamper proof "seals" in place of our reg adjuster. From all the Facebook comments, doesn't sound like the power wheel does muxh for them, just small differences in fps like you're experiencing. By law the UK guns are hamstrung by low reg pressure.

Their guns aren't defective, just how they're set up. Same as yours, your gun isn't defective, just too much hammer spring for what you want it to do.

You can hold the spring and wheel out of the gun and spin the wheel to feel how the preload on the spring increases as the power wheel is turned.

 

[tec]

I understand the physics…but i dont understand why they would put in a spring that doesn’t “work”, even when the reg was 156 bar it did nothing. I thought the whole point of the rifle is to be able to tune the ft/s to optimize pellet performance and maximize air use efficiency?

 

[Franklink]

I'm not sure which spring is "supposed" to be in a .177 HP. Assuming it's the 0.047", perhaps the assembler that day grabbed the wrong one? At a glance they look like the same spring.

Or maybe they figure someone buying a "High Power " .177 wants big oomph, so they put the heavier spring in it to maximize power output.

 

[tec]

Hmmmm. Tomorrow i will crank the reg up …and see if the wheel does anything at higher pressures

 

[tec]

~175 bar Reg
Max 2548 psi/1092 ft/s, 2519/1086
Min 2516/1047, 2512/1049
So ~ 40 ft/s diff Max to Min at 175 bar reg pressure...and muzzle crack loud!

 

[tec]

Brocock / BRK Ghost Hammer Spring - Bagnall and Kirkwood Airgun Spares

Replacement hammerspring for the Brocock Ghost air rifle Available in 5 versions: Low Power – UK 12fltb spec – Brocock state this is for all sub 12 versions, but we have came across rifles with higher power springs fitted from factory – we recommend checking with specs below. Medium Power –...

spares.bagnallandkirkwood.co.uk

So 5 different "power" spring options...you would think this would be an "option" that you need to specify when you order a rifle.
And, to your earlier point, if I wanted a rife to move very heavy projectiles and the ability to put the 22,25,30 barrel on and move them..then the HP2 spring would be the way to go...
thank you again for all the support and knowledge transfer! For a couple minutes there I was second guessing myself on this purchase...haha ok still second guessing ...cause it was the Ghost or the M3...but as someone said I can't go wrong with either...
tc

 

[MartinT]

So I finally got my Ghost this week, it's a .22 Plus version (which has the shorter barrel, but standard size bottle).

I like it, but the powerwheel is doing only like a 10% change in velocity between min and max on 150 bar (with 18gr pellets) and decreasing to 0% at 85 bar. So I guess I got the HP spring while it should have been the medium spring (acc. to the link tec posted above.)

What I am severely disappointed about is the crazy amount of trigger creep on the second stage. (after the first stage comes to a stop, there is backward movement when finger pressure is increased before the sear breaks) I haven't heard anybody complain about this (only about the weight of the second stage) so I wonder if mine was not checked for this at the factory. I don't see any adjustment for creep in the handbook, unless it is the "C" screw which is factory set, and we are not to adjust it (according to the afore mentioned handbook) As I am not in the US Derrick is unfortunately no option... So what will happen if I change the setting of the "C" screw? Or is there anything else that can be done?

 

[Franklink]

So I finally got my Ghost this week, it's a .22 Plus version (which has the shorter barrel, but standard size bottle).

I like it, but the powerwheel is doing only like a 10% change in velocity between min and max on 150 bar (with 18gr pellets) and decreasing to 0% at 85 bar. So I guess I got the HP spring while it should have been the medium spring (acc. to the link tec posted above.)

What I am severely disappointed about is the crazy amount of trigger creep on the second stage. (after the first stage comes to a stop, there is backward movement when finger pressure is increased before the sear breaks) I haven't heard anybody complain about this (only about the weight of the second stage) so I wonder if mine was not checked for this at the factory. I don't see any adjustment for creep in the handbook, unless it is the "C" screw which is factory set, and we are not to adjust it (according to the afore mentioned handbook) As I am not in the US Derrick is unfortunately no option... So what will happen if I change the setting of the "C" screw? Or is there anything else that can be done?

The two biggest improvements to that trigger are cutting a few coils off the trigger rod return spring (sits right in front of the trigger cassette at the rear and bottom of gun) and lightening up the first stage spring by over compressing (outside of gun) or replacing with a lighter spring. That first stage spring is located in the trigger mechanism right above the trigger blade, under the plate that the safety goes through.

I'd recommend those spring changes first, and then see what you have for creep. I suspect the creep can be adjusted out once those springs are taken care of. Mine doesn't have creep.