This guide details the installation of the South African Defense Force (SADF) .22LR conversion kit for the R4 rifle, developed by Thor Engineering. The kit allows for low-cost training by converting the rifle to fire .22LR ammunition using an open-bolt blowback system. Expert Ian McCollum explains the process, highlighting the unique sear interaction and the use of a modified Mauser magazine. The guide emphasizes careful assembly for proper function.
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