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SR7 and Madbull OSS barrel extension

madbull oss sr7 km4

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#1 ssurfe4

ssurfe4

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Posted 03 March 2014 - 07:43 AM

Has anyone installed the Madbull OSS barrel extension on the KM4 SR7?  I am wondering if it will fit snug against the rail or even fit inside the rail if necessary.





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