Ordered a QB78 Deluxe

[Brutuz]

Hmzzzz, took it apart again, washers inside isn't the best idea I was told.

Took a pic of the probe and fitted a new o-ring



Also replaced the breech seal, lucky I got two of those. The first didn't look in the best shape after taking the rifle apart a couple of times.

Removed the washers, took a standard Crosman hammerspring, clipped it, compressed almost the 0.25” tuners recommend, and guess what, works like a charm.

The standard QB spring cannot slide over the Crosman spring.

Here's a pic:



Result:







Checked the H&N holes I shot before inserting the extra hammerspring



It barks a bit more too.

Pitty I don't have a chrony.

[Brutuz]

Here's Take III

10 meter indoor shooting and shotcount

abt 47 good shots from 2 powerlets

http://www.youtube.com/watch?v=EUFVEg6BB3g

[North Pack]

That was great Brutuz, - liked the music, and the shooting wasn't too bad either. Nice going, ...

[Brutuz]

Thanks North Pack

Still have to polish the friction parts of the trigger and practice more @ 10 meters.

Did gather the funds to order a chrony so there will be another QB78 vid online one of these days.

[Brutuz]

Yessssss

I've got a Chrony

Here are the results

(RAF / rate of fire)

Do need an indoor light fixture for shooting after dark..

Will take it apart again and pollish again, this time using a powertool.

Will also remove the extra piece of hammerspring to check the difference.

[Bentong]

Are you considering a valve mod? I drilled 4 holes in front of the valve, notched washer  and tapered the valve stem. I kept the plunger just tapered it too so I can switch from bulked to carts without pulling the valve for switching. I can still get 30 bulked and 40 carts shooting high 6's and low 7's on 14.3 CPHPs. Got really loud so I fixed her.

[Brutuz]

I've seen the valve mod and am tempted but will not mod it for the time being.

[Brutuz]

Last night's string had a few errors due to bad lighting.

Made my own light fixture using plain 40W bulbs and a piece of aluminium strip.

Did a 16 shot string last night so it was still charged with CO2, had a few errors first emptying last nights powerlets but soon figured the height of some shots was causing that.

Emptied the gun, loaded 2 new powerlets, dry fired twice and had dinner.

After dinner I shot this error-free 50 string using the 7.1 grain H&N Hollowpoints:



(No alterations on QB, only had time to make the light fixture)

[Brutuz]

After polishing the hammer unit this afternoon:

Could a .177 QB78 owner please comment on the performance?

[Brutuz]

Two 10 shot targets to show the grouping and 10 shots on the Chrony using a more common grain pellet:

http://www.youtube.com/user/Brutuz62#p/u/0/YAIlop5qAqQ

[Brutuz]

Boring vid after tweaking the valvebody: http://www.youtube.com/watch?v=RBKRRqclQ-M