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Dong, the Magpul 50rd is not compatible with the SCAR 17s : -- https://www.rkguns.com/magpul-pmag-d-50-308-win-7-62x51mm-50-round-drum-magazine-mag993-blk.html ----------------------------- You would need : - https://promagindustries.com/fn-scar-17-308-50-rd-drum-black-polymer/

Dong, the Magpul 50 round drum won't fit the fn scar 20s. Promag does make a 50 round drum that will fit. Here's a link to the promag one if interested............ https://gun.deals/merchant-deals/9145024896