usable range of airsoft guns

One would hope a little more care is taken when chronographing minorities.

 
been looking for barrels and hop rubbers, hope someone knows whats best.

barrels seen a km head teflon 6.04mm

guarder 6.02mm

prometheus 6.03mm

all are a bit longer than the barrel they are replacing, take it they will be easy to cut down if needed?

rubbers, jbu high stength

and ares high stength rubber

any input?

thx

 
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