this pw arms panzer extension tube is designed for the benelli m4 and panzer arms m4 clones. The threaded tube replaces you magazine cap and gives you the ability to. the rx arms benelli m4 magazine extension is for those m4 owners who do not wish to perform the tasks needed to swap out their oem benelli m4 magazine full. panzer m4 magazine extension tube. This will not work on the benelli m4. There is a very. picked up my panzer m4 today but i'm struggling to remove the extended tube after unscrewing the top. Eliminate the hassle of adding.
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