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SMK QB/XS/TH 78 or 79* Tuning kit without the bolt probe
78/79 kitd
£35.95 inc. tax
XS 78*
SMK QB/XS/TH 78 or 79* Tuning kit without the bolt probe Summary

SMK QB/XS/TH 78 or 79* Tuning kit without the bolt probe

Professional Tuning Kit on tuning and servicing etc for the SMK QB/XS/TH 78 or 79 models. Without the bolt probe, for customers who already have a modified bolt probe. NOTE YOU HAVE TO FIT ALL OF THE PARTS TO GET THE PERFORMANCE. REMOVING ONE COIL AT A TIME IF POWER IS TOO CLOSE.

MINUS modified Steel Pellet probe, our modified exhaust valve (our shaft is made of Stainless Steel and unscrews from the Brass head for easy seal replacement, unlike the std one), stainless steel piercer, an Aluminium Piercer body**, Moly 33 or O ring grease, Modified Steel Valve block, MS 1 lube, and a full set of high quality replacement seals including the transfer port. These seals will last. 

The standard power of these guns is only 6 to 8 ft lbs and this kit brings the .22 nearer the 12 ft lbs limit for hunting and vermin control, the .177 will be less efficient so may be a little lower.
Check the power after fitting to make sure the gun does not exceed 12 ft lbs. Make sure you use a reputable high quality Chronograph because we have had some customers worried that their guns have gone over or are well under after fitting our kit, only to find when it is checked on a proper chronograph that it is doing very well at 11.5 ft lbs.


Don't forget to state which calibre you require or .22 will be sent. 
*Please note that the 79 models are a bit more to cover the price with extra high Quality O rings.
Always check the power to make sure the gun does not exceed your limit, after changing any parts.
NOTE
**Modified piercer body eliminates original filter, washer, tube & gauze. DO NOT try to fit the filter tube or gauze in our Piercer body, our Piercer Body is made to be more efficient than the standard and made of High Quality Aircraft grade Aluminium.

The later side lever match rifle has a different bolt probe so this kit is not suitable for the side lever match.

On a few rare instances we have found that some XS/QBs can lock up when you tighten the top screws that hold the breech down, if yours does this then it is worth checking that your hammer operating pins are not too long. There is a square pin at the back and the round one at the front. If yours is locking up when you tighten the top screws then taking 2 to 3 mm off the bottom of these may free it up.

You can watch the video for free on this site under SMK Stripdown Video on the left side panel store links, at the moment it is the fourth one down.

I did offer this without the bolt probe, but it caused some confusion so I have removed it. The power would be limited without it. That is why it is important to fit all the kit. If you don't then it will limit the power. I am saying this because I have had some customers ringing me up saying that their expert friend said that they did not need to fit that part, so they never fitted it. They then ring me up saying that the performance is not that good. You have to fit all the parts and make sure it does not go over your legal limit. If it does on rare occasions then you can cut a coil off the hammer spring.
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