M870 HPA Carbon Stock - FAQ

Is it safe to run my M870 on HPA?

So long as you run around 100-120psi, it should be fine. Expect HPA to cause more wear and tear on the replica since it’s expected to run at lower pressures. Inspect and maintain all the seals at regular intervals.

How do I fix the small leak between the grip and my M870?

If a leak occurs upon installation, check both faces the o-ring butts up against for any burrs or damage. If a leak occurs later on, it’s likely the same o-ring (#104xN70 Buna) that’s been damaged, or the grip may have loosened.

Instructional video in progress