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Poor shimming seems probable as I've seen an 8.4 1100mah battery do 400fps on standard gears. However it only does semi with the first 20% of the battery, and if you stop at a point where the spring is compressed it jams and you need to hookup a more powerful battery to get it going again lol
Sounds like your in winnipeg, lots of competent gunsmiths outside of XT! Are you on the MAA forums?
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