Epiphany / O-Ring Specs

O-Ring Specs

Inner body assembly, o-ring locations labeled — from the official Smart Parts Epiphany manual

Firebolt o-ring inspection points — bumper, middle, and rear o-rings — shown next to the fire chamber it seats in

The Epiphany ships stock with a Firebolt, and several sizes below carry the “Firebolt” name accordingly — if you’ve swapped to a different bolt, confirm sizes against that bolt’s own documentation.

Removing old o-rings: a 45° hook pick gives the best angle to get under a seated o-ring and lever it out of its groove without gouging the surface it seals against. If service has lagged, a dried-out o-ring can deteriorate and crumble — in the worst case it comes out in pieces rather than as one ring. Get every fragment out of the groove before installing the replacement; even a small piece left behind will keep the new o-ring from sealing.

Fire chamber / bolt

Location	Size	Part #	Notes
SFT o-ring	17/90	ORN01790UR	Same size and role as on the standard Ion — common cause of paint breaking when worn.
Firebolt bumper	15/90	ORN01590CUR	The Ion 1.0 manual prints this as ORN01590UR — same dash size, durometer, and material (UR). No documentation found for what the extra "C" in the Epiphany manual's version denotes, so treat this as the same physical o-ring in practice.
Firebolt middle o-ring	16×2mm / 70	—	Material not confirmed for this one specifically — the standard Ion's equivalent (Bolt middle o-ring) is HN, but per this site's own rule of not assuming Epiphany parity without checking, that's not carried over here as fact.
Firebolt rear o-ring	10/70	ORN01070UR	Same number as the standard Ion's rear bolt o-ring.
Bolt stop inner o-ring	14/70	ORN01470UR	Matches the standard Ion bolt stop sizing — this is the same physical part (Smart Parts #ION111) across Ion 1.0/2.0/Epiphany.
Bolt stop outer o-ring	20/70	ORN02070BU	Matches the standard Ion bolt stop sizing — same shared part (#ION111) as the inner o-ring above.
Body breech friction o-ring	22/70	ORN02270BU	Matches the standard Ion sizing.
Body breech seal o-ring	20/70	ORN02070BU	Matches the standard Ion sizing.
Rear breech o-ring	17/70	ORN01770HN	Matches the standard Ion sizing.
Swivel donut o-rings (×2)	15/70	ORN01570BU	Same size as the standard Ion, but Buna-N (BU) here — Ion 1.0 uses urethane (UR) — per each manual's own Fig. 18. Part number constructed from the site's own established Smart Parts numbering pattern (dash size + durometer + material code), not independently found written out in either manual. Underneath the donut, once the donut clip is removed — see Firing Assembly for the removal procedure.
Feed tube friction o-rings (×2)	5×25mm ID	ORN02552070BU	Same part as the standard Ion — the Epiphany's feedneck style just uses two of them instead of three, per each manual's own Fig. 18.
Ball detent bore (×2)	6.35mm diameter	—	Matches the standard Ion's bore size — measured directly on an Epiphany body breech, not manual-sourced.

Regulator

Location	Size	Part #	Notes
Reg cover friction o-ring	22/70	—	Epiphany-only, so there's no standard-Ion equivalent to cross-reference for a part number, and material isn't confirmed either. The standard Ion's grip is rubber all the way through, so the rubber itself grips the metal regulator body directly — no o-ring needed. The Epiphany's cover has metal in it (likely a magnesium finish, matching the plated body), which would otherwise sit metal-on-metal against the regulator body — too slippery to stay put on its own. This o-ring sits between them, adding the friction that holds the cover in place and keeps it from rotating freely around the body.
Regulator o-ring	15/90	—	Material not confirmed for this specific row — a standard CO2 bottle o-ring works as a substitute if you're stuck without the exact part.

Higher-pressure hoses and solenoid required. Most Ion low-pressure hoses can already handle Epiphany pressure — check for a rating printed on the hose itself — but the Epiphany-specific solenoid is required regardless; a standard Ion solenoid isn't built to deliver consistent shot-to-shot force at Epiphany pressures. Epiphany-rated solenoids and circuit boards are identifiable by a red protective coil wrap with a black Ion logo.