It should work with a Dark Storm Industries DS-15.
Compatible with standard AR-15 type lowers. (M4, M16, AR15). Compatible with other firearms that accept a STANAG (AR-15) magazine and have a removable upper receiver; such as the SCAR16, Bushmaster ACR, SIG MCX, CZ Bren, SIG 556, and Daewoo DR200. NOT compatible with lowers that have a custom or extended magazine well (such as Seekins SP225, Sharps Bros, HKMR, and Spike's Jack). Not compatible in bullpup firearms such as the Tavor. NOT recommended for polymer lowers.