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I acquired a junker MP5 last year (well abused, missing parts, etc. got her all fixed up and in pristine shape) and there was nothing in the cocking tube area except for a copper pipe, about 8" long or so, I'd guess 1/4" to 3/8" ID, wrapped with many layers of black electrocution tape. It sat about half way into the body, say about 4" into the body (where the spring and guide normally sit) and 4" into the cocking tube. It was done by the previous owner (said it was a rental gun for many years, and he added the pipe to strengthen the gun to better withstand "noob-abuse".)
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