The FX Impact have issues with chamber flags...
Trying to go to the range or a competition where a range master might require you to clear your chamber? Well it was a bit difficult to do that before. Chamber flags are designed for the mag wells or chamber of a larger chambers which the Impact has neither of.
Both the red flag and red anodized block machined to fit the Impact will insure your rifle is visibly safe as you and everyone else is down range.
This design also insures you aren't shoving something into your barrel where it might damage or nick something.