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Posted: 8/23/2004 6:44:31 AM EDT
I picked up a 9mm buffer this weekend to use in my M4 type AR15. The buffer seemed to be too large and was causing the spring to bind up on the buffer. Has anyone else experienced this problem? Did I get a buffer that is out of spec, or do I need a different spring than the CAR spring that I am using?
Link Posted: 8/23/2004 6:50:52 AM EDT
[Last Edit: 8/23/2004 8:56:18 AM EDT by Yojimbo]
I'm running a Colt Tungsten H buffer which is the same weight as the 9mm buffer and so far everything is working great.

If you put yout new 9mm buffer next to the old buffer you removed does the front part that contacts the bolt carrier appear larger then the older buffer?
Link Posted: 8/23/2004 7:16:10 AM EDT
Link Posted: 8/26/2004 10:56:17 AM EDT
I recently had the exact same problem. I ended up using a die grinder with a sanding wheel to reduce the overall outside diameter of the buffer. I also swapped around buffer springs until I found a looser combo. I think variations in the manufacturing of the springs has as much to do with the problem as the buffer being too big.

Link Posted: 8/26/2004 12:10:24 PM EDT

Originally Posted By SMGLee:
What kind of CAR stock do you have??

I have a 9mm buffer in my gun and i am not experiencing any problems.

Have you heard of this as an issue before? I haven't, but I don't know that many people running 9mm buffers either. To the best of my knowledge, it should be an issue.

Who made the 9mm buffer that is causing problems?
Link Posted: 8/26/2004 2:20:10 PM EDT
I think I've used every single buffer that Colt makes and have never had that problem... Always with the factory Colt springs too.

Who made the 9mm buffer you're using?

Link Posted: 8/26/2004 3:11:21 PM EDT
my two piece heavy buffer was purchased from brownells.

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