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they are 2 different guns the 40150 is a Ruger MK IV tactical two biggest differences are that the MK IV has a alloy frame and the grip angle is like a german Luger (more slanted) the 40149 is a Ruger 22/45 MKIV which has a polimer frame and the grip angle is the same as a 1911 45 ( the 45 in the name) infact 1911 grips will fit

Amanda, the 40149 has a "Polymer Frame" and the 40150 has an "Aluminum Alloy Frame".

different frame material