One of the flagship products of CAMP USA's gear array, the HMS Belay Lock Carabiner features a patented design that locks the carabiner in place on your belay loop to help prevent dangerous cross-loading. This inner-gate design boasts an intuitive design that extends to either side of the 'biner spine for full security. With both gates utilizing the same spring, the HMS Belay Lock saves weight and attaches with ease.
I am not a fan of the plastic piece. The contoured contact with the rope is also not necessary. If you want to save weight contour the edge that opposes the gate and leave the wear-point as cylindrical stock.