Distributed by Nite on CPF, these are 19mm diameter body extender tubes compatible with SureFire C bodies and C tailcaps.

These tubes are CNC machined from high quality solid aluminum bar and aggresive knurling with 19mm bore to accept all 18500 and 18650 cells while outside diameter is about 1 inch for a perfect fit in standard mounts.

All tubes are black hard anodized with 2 o'rings (one at each side) and ready to use.

Advantage of 18mm cells are longer run time, less frequent recharge, less stress to cells, longer cell life and higher current capability compare to 17mm cells while you don't have to carry oversized and heavy flashlight.

These Are FiveMega tubes in every sense. Designed and built to his High quality specs. Utilizing the very same metal shop. Proudly Made in the USA.

So what can I use these tubes for? They extend the existing FiveMega bodies, greatly increasing their usefulness:
FMBDYCC1BK (16340body) + FMEXT68 = 2 x 18500 = 3 x 16340
FMBDYCC1BK (16340body) + FMEXT102 = 2x18650 = 4x16340
FMBDYCC2BK + FMEXT68 = 2x18650
FMBDYCC15BK + FMEXT102 = 3x18500
FMBDYCC3BK + FMEXT102 = 3x18650
FMBDYCC3BK + FMEXT68 = 3x18650