GTA

PCP - HPA - C02 Gate => QB-7X Gate -W/Co2 & HPA => : Brutuz December 15, 2009, 08:57:40 PM

: Tuned .22 SMK XS 78
: Brutuz December 15, 2009, 08:57:40 PM


I've owned and tuned a .177 QB78 deluxe (http://thread-view.asp?tid=22300&posts=26&start=1)  which I've sold recently and bought a standard .22 SMK XS78.



Before selling the QB I switched the stock and triggergroup. I'm not a fan of the truglo sights, they are good but don't like the looks, so I din't swich those.



Started tuning the .22 according to the CdT method the day I received it.



I get abt 32 upto 35 good shots depending on the rate of fire.



Polished the inside of the hammerunit last night. Read people using emmery cloth, didn't have that so got some from Gmac together with an order of brass parts.



Turns out it's sandingpaper on a linnen back. Strange it's called emmery cloth, very confusing for Dutch people LOL.



So last night after polishing the inside of the hammer unit I preloaded the hammerspring with one shim instead of the 0.25" I used before and the results were the same as before the polishing, which is quite an improvement. Qurious as I am I preloaded the hammerspring to 0.25" again after shot 7 and notice no improvement, so I took them out again after shot 14 to see performance is good without them and it results in a flatter curve. No pausing beteween shoots. Never thought polishing the inside of the hammerunit would have such a positive effect.

                                                                                                                                                                                                                                                                                                                                     
SHOT
FPSRem.


1677first after reass. & 2 new powerl.
27011 shim
37011 shim
47031 shim
56981 shim
66991 shim
77011 shim
8703preloaded .25"
9701preloaded .25"
10692preloaded .25"
11696preloaded .25"
12700preloaded .25"
13695preloaded .25"
14693preloaded .25"
156951 shim again
166961 shim again
177001 shim again
186981 shim again
196961 shim again
206871 shim again



Since I'm very pleased with this rifle I ordered some brass parts from Gmac  (http://"http://www.gmaccustomparts.com/epages/BT3197.sf/en_GB/?ObjectPath=/Shops/BT3197/Categories/XSQB78_Custom_Parts)(UK)



Here's how it looks now.



(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/xs78-brass-stock-bolt.jpg)



(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/xs78-tube-and-breech-endcap.jpg)



(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/xs78-barrelband.jpg)



(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/xs78-tube-and-breech-endcap-and-bolthandle.jpg)



(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/xs78adapter-endcap.jpg)



(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/xs78-left.jpg)



(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/xs78-right.jpg)



MuzzleBrakes like in the pic are legal in the Netherlands.



If the last 2 pics are inappropriate a moderator may remove them together with this line and the statement above this line.



If you'd like to see some vids please check these I made



Take I (http://"http://www.youtube.com/watch?v=WJsjj9OXsnc)



Take II (http://www.youtube.com/watch?v=Vu10RFopMoM)



Take III (http://www.youtube.com/watch?v=YWEIqbvhdrs)



Take IV (http://www.youtube.com/watch?v=q9eCdxIJmp8)



Take V (under construction)

: RE: Tuned .22 SMK XS 78
: lastmanout December 16, 2009, 01:59:23 AM
Beautiful job on the brass metalwork. Nice tune-up.
: RE: Tuned .22 SMK XS 78
: Brutuz December 16, 2009, 05:12:17 AM


lastmanout - 12/16/2009  3:59 PM  Beautiful job on the brass metalwork. Nice tune-up.



Thanks (http://../jscripts/tiny_mce/plugins/emotions/images/smiley-cool.gif)





Made the last vid this afternoon:



http://www.youtube.com/watch?v=A_4pmh3duys (http://www.youtube.com/watch?v=A_4pmh3duys)





: Re: Tuned .22 SMK XS 78
: Jaymo December 16, 2009, 01:32:56 PM
It's called emery cloth because it's emery abrasive on a cloth backing. Now, why is crocus cloth called crocus?
: Re: Tuned .22 SMK XS 78
: dk1677 December 16, 2009, 02:37:40 PM
Very nice work!
: Re: Tuned .22 SMK XS 78
: Brutuz December 16, 2009, 07:49:23 PM


Jaymo - 12/17/2009  3:32 AM  It's called emery cloth because it's emery abrasive on a cloth backing. Now, why is crocus cloth called crocus?



Emery isn't a common English word overhere, hence the confusion thinking it was something special which it isn't.



On the crocus remark I would apreciate a bit of understanding for foreigners more than talking us down like that Jeremy.



Just read some of your earlier posts and you look like a cool guy (http://../jscripts/tiny_mce/plugins/emotions/images/smiley-smile.gif)



: RE: Tuned .22 SMK XS 78
: Brutuz December 17, 2009, 09:32:10 PM


Check this (http://../jscripts/tiny_mce/plugins/emotions/images/smiley-surprised.gif)





(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/sbb2.jpg)

: RE: Tuned .22 SMK XS 78
: Brutuz December 18, 2009, 12:33:17 AM
Grouping wasn't bad, 2 five shot groups @ 10 meter:

(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/sbb3.jpg)
: Re: Tuned .22 SMK XS 78
: Jaymo December 18, 2009, 05:13:29 PM
I wasn't talking down to you, Brutuz. I apologize if it came across that way. That was not my intention. I actually wonder why crocus cloth abrasive is called that. I don't know if crocus means something in Dutch that it doesn't mean in English, but crocus cloth is an actual abrasive/polishing cloth here in the USA.
: Crocus cloth definition
: Jaymo December 18, 2009, 05:23:18 PM
According to about.com, crocus cloth is an iron oxide coated abrasive cloth, used as a polishing agent after most of the work has been done with aluminum oxide or emery. Basically granular rouge. Sure makes more sense than coating cloth with a crocus flower.

It says that emery is a granular form of impure corundum.

: Re: Tuned .22 SMK XS 78
: Brutuz December 18, 2009, 07:42:19 PM
Overhere we only know the crocus as being a flower/plant, hence another confusion on my part. Thanks for explaining it.
: RE: Tuned .22 SMK XS 78
: Brutuz December 19, 2009, 10:15:04 AM


Did the extended probe mod and boy am I sorry I did.



Gain in fps: ok



Uses more CO2: can live with that



Loading pellets: big dissapointment - they tumble/tilt now



Seems to me the only way you can load a pellet is whith the barrel pointed to the floor.



Here's a vid I made  (http://www.youtube.com/watch?v=Nl-6JeBbYRo)









: Re: Tuned .22 SMK XS 78
: Jaymo December 20, 2009, 07:52:56 AM
Sorry the bolt probe mod didn't work out for you. i may not do that to mine.

Yeah, when I did a Google search for crocus, I came up with  a European flower, also. I thought, "Surely abrasive cloth isn't made of THIS." ;`)

In retrospect, I can see why it's not called rust cloth. Nobody would buy it. Why they don't just call it rouge paper, I don't know.
: Re: Tuned .22 SMK XS 78
: Brutuz December 20, 2009, 08:12:20 AM


Tested a few other pellets today, it seems only these H&N hollowpoints and the smaller pellets tilt, others loaded smoother.



Still think the hollow probe loads easier, so if you're looking for extra fps the extended probe is last on my list.



: RE: Tuned .22 SMK XS 78
: Brutuz January 06, 2010, 01:33:26 AM


Thanks to a member of ukchineseairgunforum.myfreeforum.org it's got an extended hollow probe now :-)



(http://www.crosman-air-pistol-owners-forum.com/pics/Brutuz/XS78.22/xs78-extended-hollow-probe-triballofts.jpg)

: Re: Tuned .22 SMK XS 78
: lastmanout January 08, 2010, 01:52:26 AM
Thanks Brutuz  for posting your adventures with the extended probe. Will definately use the hollow stem on my next tune up.
: Re: Tuned .22 SMK XS 78
: kp4att January 08, 2010, 03:12:40 AM
THOSE BRASS PARTS MAKE THAT BABE LOOKS AWSOME.
: Re: Tuned .22 SMK XS 78
: geewhiz380 January 08, 2010, 04:39:20 AM
they r awsome geraldo i have the qb78.22 and its very accurate u could add a tko muzzle brake on it its co2 or u could have it bulk filled ....jorge
: RE: Tuned .22 SMK XS 78
: jake February 13, 2010, 10:53:20 AM
thats one fine looking shooter!
: RE: Tuned .22 SMK XS 78
: SDale February 14, 2010, 02:06:34 PM
If you polish the hard lip off of the countersink in the breach, pellet loading will be MUCH easier with the probed bolt. I had the same problem with my 79 after the bolt probe mod.
: RE: Tuned .22 SMK XS 78
: howie1a March 03, 2010, 01:15:06 AM
Very nice I loved your vid's the only thing you need now is one of my stocks see the pic howie
: RE: Tuned .22 SMK XS 78
: longislandhunter March 03, 2010, 04:27:04 AM
That is one fine looking piece of wood Howard  !!  Wish I had your skills.....

Jeff