These 7mm ball bearing bushings from Classic Army greatly reduce friction on the gears when they are turning, ultimately making the motor's job easier and the gun more efficient. Ball bearing bushings are a great upgrade from stock plastic bushings, but not recommended for guns with very high rate of fire or high velocity.
Professional installation is recommended. Improper use or installation of upgrade parts are 99% of the time the cause of failures of these items.
These are good, but do not use these with anything over an m100
These will definately increase your rate of fire, by a lot. I have some in 6mm, so i don't know how the 7mm perform, but as mentioned above, don't use these with anything over an m100.
I have a mixed combination of 4 CA 6mm bushings, in my gun, for the sector gear and the spur gear, and 2 CA 6mm ball bearing bushings on the bevel gear. I went to do a routine check up on my gun. and I looked at everything and I noticed that one of the ball bearings had blew out. It was an easy fix, just replace it with a regular bushing, and reshim the bevel gear. However, while the bearings blew, the regular CA bushings did not, and looked untouched. I've owned my TM m16 for about 4 months, and I upgraded it to an m120 right after I bought it. So in my experience, one of them lasted about 4 months before it blew out.
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