I do not have a Shorty45, but I believe they are the same size as the railed version of the 4513TSW, although much better fitted, with more attention to detail, and no rail. I do have a 4513TSW later version 7 round magazines, with a rail, a 4513TSW early version 6 round magazines, without a rail, and lastly a CS45 6 round magazine. The 4513's have a 3.75" barrel, the CS45 has a 3.25" barrel. The railed 4513 has Hogue grips and a Streamlight TLR-1 HL, outfitting it for nightstand duty.