REIONIZED

Ion XE / Rear-Load Bolt

Rear-Load Bolt

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The XE’s whole reason for existing is this procedure — Smart Parts redesigned the body around a one-piece fire chamber and body breech that comes apart from the back. Routine bolt and firing assembly service needs nothing more than the rear cap off: no grip frame separation, no body splitting, not even opening the grips. Compare that to the Ion 1.0, where reaching the same components means separating the body from the frame and then unscrewing the fire chamber from the body breech to get at it.

Before you start: fully de-gas the marker before disassembly. Cycle it with the air source removed until it will not fire.

What you’ll need

  • 5/16” hex key
  • A soft push tool. A barrel squeegee like Exalt’s Barrel Maid works well — its flexible, sheepskin-wrapped shaft is built specifically not to scratch a bore. A wooden chopstick or plastic toothbrush handle works too, if you’d rather not buy a dedicated tool. Don’t use metal, which can scratch the bore.
  • Molykote 33 Light marker lubricant (or equivalent silicone-based paintball grease) — see Firing Assembly for why grease, not oil, is right for this style of valve
  • 70% isopropyl alcohol (an ultrasonic cleaner works well for a thorough pass), or an aircraft-safe electronics cleaner
Part numbers, per Tippmann Parts: Bolt Assembly — ION109ASM (same numbering as the Ion 1.0's plain bolt, consistent with the bolt being identical across the family). Bolt Stop Assembly — VIB111ASM, a different physical part from the Ion 1.0/2.0/Epiphany's ION111 — its inner o-ring matches, but per my own hands-on measurement the outer o-ring is 18/70, not the 20/70 used on the 1.0/2.0/Epiphany (see [O-Rings & Torque Specs](/guides/ion/orings-and-torque/) for the full spec table). Bolt Sleeve Assembly comes in two lengths, sold as separate parts — VIB104ASM (short) and VIB104ASM A (long) — worth confirming which one your marker actually has before ordering a replacement.
Why the bolt stop is a different size at all: the XE's one-piece fire chamber and body breech (see above) has a smaller inner diameter than the Ion 1.0/2.0's separate fire chamber and body breech, so it needs a smaller-diameter bolt stop to match — hence the different outer o-ring size. The XE bolt stop also does a job the Ion 1.0/2.0's doesn't: it butts up directly against the bolt sleeve (the rear cap) to stay in place, since there's no swivel donut or separate rear body section holding it here the way there is on the front-loaded design.

Disassembly

  1. Unscrew the bolt sleeve from the back of the marker with the 5/16” hex key.
  2. Using the soft push tool, push the bolt, bolt stop, and volume control insert (if your bolt has one) out through the back. If you know your marker is well-maintained, a few firm taps of the rear against your palm can walk everything out far enough to finish pulling by hand — but that’s only a good idea because it’s already in good shape. If you’re not confident of that (unknown history, hasn’t been serviced in a while), default to the push tool instead.
  3. Clean the interior of the body, the bolt sleeve, the bolt, and the bolt stop with isopropyl alcohol. Inspect every o-ring for rips or cuts — see O-Rings & Torque Specs for exact sizes.
Not the same as the Epiphany's insert system. Smart Parts' own XE manual addendum mentions this insert only as a single part some bolts include ("if present") — no color-coded variants, unlike the Epiphany's three-insert (silver/blue/green) volume-tuning system covered on its own Fire Chamber Volume Inserts page. Don't assume the two are the same feature.

Reassembly

  1. Lubricate the o-rings.
  2. Slide the volume control insert into the bolt sleeve, if present.
  3. Slide the bolt stop onto the bolt from the rear.
  4. Slide the assembled bolt/bolt stop into the rear of the marker.
  5. Screw the bolt sleeve back into place — snug, but don’t overtighten.

That’s the entire routine service procedure. Recommended interval: after every 3–4 days of use, or any time you notice erratic performance or visible paint/dirt contamination.

No swivel donut on the XE. The rear grip frame screw and banjo fitting thread directly into the body breech instead — if you're cross-referencing the Ion 1.0 teardown guide, that's the one part of the body sequence that doesn't apply here.
  • Electronics — identical to Ion 1.0/2.0
  • Regulator & ASA — identical to Ion 1.0/2.0
  • Troubleshooting
  • Need the board, solenoid, or Vision system instead? See Teardown — grip frame separation is identical to Ion 1.0, but you don’t need any of it for routine bolt or firing assembly service.
Bolt stop comparison, side profile — Ion 1.0/2.0 (left) vs. Ion XE (right)
Bolt stop comparison, side profile — Ion 1.0/2.0 (left) vs. Ion XE (right)
Bolt stop comparison, face-on — Ion 1.0/2.0 (left) vs. Ion XE (right), bore size difference visible
Bolt stop comparison, face-on — Ion 1.0/2.0 (left) vs. Ion XE (right), bore size difference visible
Bolt, bolt stop, and bolt sleeve laid out left to right, front to rear — same orientation as the marker itself
Bolt, bolt stop, and bolt sleeve laid out left to right, front to rear — same orientation as the marker itself
Close-up of bolt/bolt stop o-rings — inspection points
Close-up of bolt/bolt stop o-rings — inspection points

More than you want to tackle yourself? Check out the finished builds or get in touch to have your Ion serviced.