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IMHO, a tightbore has the worst cost/benefit ratio of any upgrade.
Its just not going to net you that much extra speed or power.
Really you should look at a spring that runs 360-380 fps. Then get a stock TM barrel (loose bore as possible) in a short length to swap in for CQB (ideally with a spare hop-up). The cylinder porting used for the longer outdoor barrel will be wrong for the short one and you will probably loose just enough speed to be under the CQB limit. I've tried this before and it let me run one gun in two different "modes" without having to open the mechbox all the time.
-Grant
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