These safety selectors give me a mixed review....on one hand they feel a million x's better than OEM (that's for damn sure)...but on the other $50 (damn near after shipping) is crazy for these two tiny pieces...I own a PMR, a CMR, a CP33, and a Sub2k.....I figured i would buy one and test it and buy them for the other guns....as great a they feel....i will only buy them again if they go on sale, or if BLEM's are offered or something like that comes up....compared to TandemKross they are much better because you get both sides for basically the same price...but TK's also can be used as a rear thumb rest which these cannot....so its give and take....I will prob try TK's selector out next time, unless i can get these MCARBO selectors cheaper somehow...... just my $0.02....oh and if anyone is running a Farrowtech Carbon Telescoping Brace, It will only retract when SAFETY IS ON....when safety is off the brace hits these selectors