I believe you misunderstood what I did. I used a regular carbine H3 buffer, not the A5 buffer. Without the spacer, the carbine H3 buffer would be 3/4" too short for the extended length of the AR-10 buffer tube. Operating the rifle like that would instantly cause the destruction of the lower receiver, so do not try this.
My spacer was made to fit inside the spring, so as to not cause any compression of the spring. Too, the mass of the spacer is less than an ounce, so it made no difference, in that respect.



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