tightbore barrel=fps increase?

Slightly yes but don't expect a huge increase

 
Slightly yes but don't expect a huge increase
Indeed. Upto 30fps increase usually!

If you are intending to increase your fps a bit, put a small bit of thin tape on the base of the hop rubber and/or hop unit. This will seal it, decreasing airleaks. :)

 
I have it on my G&P M4. Basically where the hop unit ends, you tape it down to the barrel.

I will grab you a photo at some point!

All it does is make your gun more efficient with it's air pocket by stopping a leak.

 
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