's SMK XS79 Part I May 15, 2011

This is a video about my bolt action .177 cal SMK XS79, aka QB79, aka "Techforce 79 tanker", allthough the Techforce 79 has got a nicer stock.
SMK XS79 & 88 gram adaptor bought from Dave (Fatman). Bolt handle & silencer made by & bought from Dave (PorkyYorky). Sighted silencer adaptor bought from http://www.gmaccustomparts.com. Sealkit & replacement screws bought from Will (Welsh Willy) http://www.woodfield.co.uk. Quick change 12g CO2 adaptor bought from http://www.rap4uk.com. Tuning how to's for free at http://ukchineseairgunforum.myfreeforum.org (thanks).

No mods done to the striker block, no preload to the hammerspring, no weaker valvespring used. While waiting for the 12 gram adaptor fitted the PorkyYorky replacement bolt handle and filed a notch into the stock. Allthough it's a pre-owned rifle it was technically untouched when I received it. De-burred scew-hole inside breech to prevent barrel o-rings from clipping. Fitted new o-rings on barrel, lubed with silicone grease the o-rings came in. Enlarged probehole, ellipse shape forward direction. Fitted new o-ring on probe, lubed with pellgunoil. Lubed bolt (thin coat nd-oil). Replaced transferport seal after cutting off a few mm first to prevent it from crushing. Reassembled rifle. Had become a bit noisier. Did an accuracy test, outdoors, 13/14 yards, open sights, sitting, elbow supported. Valve work: Tapered the piercing pin, removed the filter, notched the washer, drilled two holes in the valve body. Rifle has become even nosier now, glaf silencers aren't prohibited in the Netherlands so fitted a Gmac adaptor + PorkyYorky shorty silencer which was custom made for one of my pistols. Remarkable that performance is lower when using the 88 gram adaptor. Flattened the bottom side of the breech where the tp seal goes. Flattened the valve's exhaust port surface, enlarged the bottom valve screw hole to allign the top port hole 100% and came up with a mod to keep the tp seal centered while reassembling the rifle. After several attempts with tp seal height got it to seal 100%. I've used a piece cut off from a valve rubber for woods valves, Google Valve rubber for woods valves to see what I've used. I've "invented" a similar mod using Valve rubber for woods valves to seal the top side of the valve-to-barrel sleeve of my Crosman 13xx'es and 22xx'es a few years ago. The 79 performs quite good now, happy with the results. An 88 gram does not perform as good as the 12 gram adaptor though, must be the adaptor causing a more restricted flow.

Part II May 29, 2011

Got a co2 fire extinguisher for free. Bought a fillstation and 7oz bottle with on-off valve. Added WelshWilly alloy end caps & a trigger shoe. Blackened the brass silencer adaptor. Fitted a bling bling PorkyYorky silencer. Average 10 shots w. .177 cal JSB Exact Diabolo's 724 fps / 729.2 fps high - 720.7 fps low / 8.5 fps spread
End caps, trigger shoe and allen headed screws & bolts: http://www.woodfield-gcp.co.uk/a-custom-parts.htm Seal kit: http://www.woodfield-gcp.co.uk/pre-lubed-seals.htm Silencer adaptor: http://www.gmaccustomparts.com Bling silencer & bolt handle: PorkyYorky @ http://ukchineseairgunforum.myfreeforum.org Fillstation & bottle: Dutch paintball store Note: silencers are legal in the Netherlands

Part III April 15, 2012

Shooting my tuned .177 cal SMK XS79 and showing custom SeanQ stock made of idigbo wood (tropical hardwood from West Africa)

Also showing a few of the other stocks Sean has made

Sean can be reached here http://ukchineseairgunforum.myfreeforum.org

Custom parts:

bolt handle PorkyYorky also active here http://ukchineseairgunforum.myfreeforum.org

end caps seal kits WelshWilly on http://ukchineseairgunforum.myfreeforum.org or his own website http://www.woodfield.co.uk

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