I bought this gauge for my g3 and it helps so much i guess i had my pressure set too high so it saved my gun from possible failure
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Great Gage for G3
February 4, 2009
Reviewer:
GTF fer life
from Sanderson, FL United States
The Dangerous Power G3 doesn't come stock with a gage, this leaves you with two options get a reg with a gage or get this. The gage mounts flush into the back of the gun and accurately reads the internal operating pressure. It is easy to see and made well "its from DP". I would recomend this gage for any G3 owner that likes to keep their gun honed to perfection.
G3 PMD 
Extremely Useful