Adaptable grip frame allows you to interchange both backstraps and grip panels in 27 unique configurations; When firing, it has the feel of striker fired trigger, but with a longer trigger pull for added safety; Comes with a manual decocking lever for traditional hammer-down carry; Ambidextrous thumb safety option allows either hammer-down carry or "cocked and locked" single-action carry; Comes with 17-round and extended 20-round magazines