You're all set...just stick with a 343mm barrel and don't sweat the little bit shorter barrel.
If you're compression is good and your nozzle/hopup seal is good, you should end up around 400fps with 0.20's.
Note, if you go with a M100, you'll be in the high 300 fps and you're trigger response will be better and your ROF will be higher than with a M110. Battery and motor will last longer as well. And no risks that you'll chrony over 400 (don't know your field limits but it's 400 around here).
Best of luck...
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