Transfer ports for FX Impact M4 ?
- By 6gun
- Barrels & Muzzle Devices
- 3 Replies
Not enough for me to care. The rest of the ports have to support the flow capability to notice it. I machined all my own parts knocking off huma and I got 7fps in my 22 700mm. If that's a gain you need, go for it. Your results WILL vary