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Old May 27th, 2013, 10:13   #9
Azathoth
 
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Join Date: Feb 2008
Location: Red Deer
If memory serves me correctly the TAR-21 had a proprietary hopup chamber. Also If I recall the inner barrel in that gun has some major "wobble" issues. Shimming internal barrel, replacing the rubber on the hopup unit, and moving to a quality weight BB of no less than 0.28g will improve your performance.
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