Nine Ball "Non-Recoiling" Two-Way Outer Barrel for SIG Sauer ProForce M17 MHS Airsoft GBB Pistol Color:Black The inner barrel is 6

The inner barrel is 6

The biggest reasons to use a LI-PO is its smaller size and better power efficiency

Comes as a set of 3 (three) rail adapters

Can use any M4 midcap or highcap magazine type

Nine Ball "Non-Recoiling" Two-Way Outer Barrel for SIG Sauer ProForce M17 MHS Airsoft GBB Pistol Color:Black The inner barrel is 6DESCRIPTIONS: Lightweight, durable CNC precision machined aluminum construction Fixed barrel does not shift when firing, increasing accuracy 14mm CCW thread adapter for tracer units and suppressors Standard barrel crown included for when you don't need any attachments A dedicated threaded fixed outer barrel for the SIG SAUER ProForce M17. The lightweight and durable CNC machined aluminum build is precision cut to perfectly fit the M17 slide. Add your