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M4 r.i.s.


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Det står för "Rail Interface System" och är en "rälsförsedd extrautrustning" som tillverkas av Knight´s Manufacturing Company.


Andra förkortningar för samma grundidé är föregångaren RAS (Rail Adapter System) och konkurrenten Atlantic Research´s S.I.R (Selective integrated Rail).

Edited by Unicorn
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