I fix the flaws that this ram has and today is the best ram Ive ever used saves air less kick lowers LPR PSI buy it just look the mod on pbnation and you'll be OK
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1 of 2 people found the following review helpful:
Flawed Design
February 7, 2009
Reviewer:
Kubli
from Beaverton, OR United States
There are two design flaws with the ram kit...
1) The shaft at the end of the ram, that is used to reduce the volume of the air chamber behind the ram, creates excess friction with the ram cap. This reduces the speed and efficiency of the ram and therefore the bolt.
2) The adjustable ram cap does not have any damping between the screw adjuster and the ram. Its just metal to metal contact. Get a nice 'tinking' sound every time you fire the marker.
Don't spend your money on it, does not perform the way it should.
has flaws but you can fix them 
Flawed Design