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Matrix Ver II CNC Steel Ball Bearing Spring Guide for Airsoft AEG by SHS (M4 / M16 / MP5 / SCAR / G3)
by Jason B. Date Added: August 29, 2012
Fit perfectly in my upper gearbox for my ICS M16A3. Stock screw matched threads for the spring guide also. I did add a little lube to the bearings before installing to be safe but they seemed to be lightly lubricated when I got it. Otherwise very sturdy construction and good quality.

Rating: 5 of 5 Stars! [5 of 5 Stars!]
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