Did you measure that yourself? or did you get that from Palmer's? I emailed them for the OD and am yet to hear back from them.

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Tippmann A5 w/ Response Trigger - Apex Tip + UMS Apex Adapter + 12" Black Palmer Brass - 20oz CO2 on Remote w/ ProLine Pro Connect - Palmer A5 Stabilizer Kit - 8" Skeleton Stock - TechT Vortex and Lightening Bolt Mod - X7 Hopper - Madman Spring Kit - Lapco Offset Sight Mount - UMS Picatinny Grip - UMS A5 RIS MkII Front Tactical Mount