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  1. #1
    Join Date
    May 2006
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    NWFL
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    13,361

    Default Deterioration of the buffer bumper and lubrication of the buffer tube.

    I just discovered that the buffer bumper on an old rifle length buffer was literally rotten. The buffer was a surplus part purchased in the early 90's and sat in storage in a buffer tube lubed with grease. Not used very much and just recently i put an upper in 7.62x39 on it. Recoil was hard and bolt was possibly moving too fast. Took a look at buffer tube and first did the quarter thing to make sure BCG was not striking the receiver at the end of its recoil. It will take 7 quarters and still lock back. I for now left it at 6 quarters and i took a look at the buffer to add some tungsten weights. When I looked at the plastic buffer bumper I saw it look deteriorated. It was also broken through the area where the rivet goes. I got it out and took the bumper off a carbine length buffer to replace it. I am using the old style round wire rifle length spring in the gun and will leave it in the gun for now.
    I will test the gun out likely tomorrow night.

    What I am concerned is that the plastic bumper rotted. I have learned that lubrication is not really needed for the buffer tube, but if you lube the BCG some oil can likely get into the buffer. So question of deterioration could still happen if lubricants play a role in this.

    So are there some bumpers that more resistant to rot over long periods of time? A greased AK is literally good for a century or so of storage. This rotten AR bumper is upsetting.
    Obviously it seems that one should change out the bumper from time to time just to be safe.
    One who hammers his gun into a plow plows for those who do not....Unknown
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  2. #2
    Join Date
    Feb 2009
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    So I am confused... You're worried about the longevity of the plastic bumper on a part that was surplus even back when it was bought almost 30 years ago? Its also like a 10 dollar part...
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  3. #3
    Join Date
    May 2006
    Location
    NWFL
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    Quote Originally Posted by Dorkface View Post
    So I am confused... You're worried about the longevity of the plastic bumper on a part that was surplus even back when it was bought almost 30 years ago? Its also like a 10 dollar part...
    better answer that I will have to check out.
    If you have a rifle-length buffer tube (as opposed to carbine) installed, then the buttstock retainer screw is too long and is protruding past (forward of) the back wall of the tube. The poly bumper is hitting it causing the damage you are showing. Install a shorter screw.
    One who hammers his gun into a plow plows for those who do not....Unknown
    ...at the end of the day its not about anything else but YOU AND YOURS..... Gabe Suarez
    ....WANT not NEED is what America is all about. ..... Gabe Suarez
    Its not about how fast you can load, but about how well you can shoot ..... Someone being saved by a speed load is not something that has happened with any regularity. Gabe Suarez

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