Very easy install. Decent part for price. I couldn't give the part 5 stars because the on off knob. Its small and difficult to tightin down due to the o ring especially if ur hands are slippery due to oil or gease or whatever.
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Large screw
June 15, 2010
Reviewer:
Evan Gaines
from Frederick, MD United States
The CP on/off is known for its super easy turning. My only complaint is the plug that came with mine to plug the hole that doesn't have the macroline elbow isn't flush. I've tightened it down as far as physicall possible. I even tried while it was mounted to a gun. The allen wrench actually started to bend, and the screw wouldn't go tighter.
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mini mount to the max
February 5, 2009
Reviewer:
james anderson
from apo, AE United States
i was a bit disappointed when i saw that the bob long marq 7 i ordered had arrived with only an asa instead of an on/off. oh well, that gives me a chance to use more cp parts! cp makes great parts at awesome prices and ans gear always has them in stock in whatever color combination you want.
pretty decent part 
mini mount to the max