GTA
PCP - HPA - C02 Gate => QB-7X Gate -W/Co2 & HPA => : Gene_SC May 25, 2007, 01:51:59 PM
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Hey anyone ever break a QB 78 barrel strap? Was reading the other day that that is one of the negatives about the QB's. it the plastic barrel straps.. Any comments?
Gene
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Are you referring to the barrel band. The problem with them is that they break real easy when tightened down. The screw is necked down and real small. The best thing to do is replace them with a metal one, preferrably Aluminum.
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Yes Bob, the barrel band. Thanks for the info.
Gene
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http://www.rjmachineshop.com/8455.html
His are reeeeeeally nice, I had one on my now someone elses QB. He put a bit of research into where to fasten the band to the gun so the CO2 tube could stretch and contract without changing the POI. It's top notch, but only works on the normal QB78 with the 14.1mm barrel, those tankers you own might not work.
Dan
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A Metal or alumunum one would be sweet on my QB78, DON'T LIKE THAT PLASTIC ONE AT ALL. Ed
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The custom made bands are top notch...well worth the price.
There are replacement bands made for the larger barreled 2028's made of metal...but those barrels are 1mm larger in diameter, so while they fit the gas tube of a 78, the barrel is too small. The metal bands for the 2078 wil also use a full diameter screw...the 78's screw is thinned in the middle....so you'll have to oepn the recess in the barrel a little. Can bush the upper section to a nice slide fit (and 3 spaced teflon strips works fine for that). Not a perfect solution, but a cheap one.
Another imperfect (but even cheaper) soluttion is one I'm still using (and being hard-headed, will keep on using until something breaks loose). Will epoxy the issue band to the gas tube, but not the barrel. Doesn't really add any to the ultimate strength, but does tend to stabalize things. Doesn't harm dissassebly, the barrel can still slide out once the screw is removed, the band just stays on the gas tube.