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Last edited by markm; 01-28-10 at 19:19.
Yup, I too have seen the roll pin drift out, interfere with the buffer spring, and cause problems.
The staking idea sounds good.
I tried staking an old buffer I keep as a spare. I wasn’t too impressed with the idea after I tried it.
The buffer wall is pretty thin. So thin that I feel if too much material is removed from the roll pin, the roll pin is no longer resting against sufficient buffer material to retain the rubber bumper.
Another draw back was the fact that after staking one side of the roll pin, when I spun the buffer over to stake the opposite side, the force of staking pushed the roll pin back in the opposite direction, pushing the first stake material outwards.
Another viable option to a walking buffer roll pin, might be drilling the roll pin hole larger, and going with the next size up roll pin.
“A leader is best when people barely know he exists, when his work is done, his aim fulfilled, they will say: we did it ourselves.” -Lao Tzu
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Another option is to use green locktite, once pin is in correct position and not sticking out. Its designed to secure items in place AFTER assembly. Creeps into assembly. As long as buffer doesn't get very hot, should work.
Use blue or red locktite if pin has to be removed for shortening.
Mark
Last edited by mpom; 01-31-10 at 11:11.
+1 on green locktite... paranoid types (such as myself) may want to use both staking and the green stuff.
Be interesting to see how they work with the pin simply removed. Those urethane bumpers are usually in there gutundtight.
Better idea maybe-- instead of staking buffer thin aluminum over the pin, flare the pin on each side, file off excess as needed.
Flaring might work Ned. But the flared end would have to be no larger than the body of the buffer so that the spring wouldn't drag on it.
I stake mine because I've had the pin start to come out. This makes it drag along the buffer spring as it cycled and then it caused stoppages. I could also hear a change in the buffer spring sound. The delrin bumper never came off at any time.
The staking holds, I've never had a roll pin walk after staking.
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Last edited by Robb Jensen; 01-31-10 at 16:55.
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