very accurate, i was able to turn my velocity up almost all the way and zero'ed the new simmons sight and it is dead on. my first time using the barrell was last weekend and I took out more people then anyone. I got hit 1 time in the beginning and was sniping them ever since. I am now a force to be feared on the field, you to could be covered in magenta.
Not a thing I can think of, the length shouldn't be a problem because if you let them creep up on you then you need to be replaced, not the barrell.
I highly recommend this product, it kicks ass and takes names.