These pistols are almost identical to the standard Glock G17 and G24 except their barrels are 6.02" as opposed to 4.49" and their slides have been lengthened to match, they also have an extended magazine release, adjustable rear sight, and a 3.5 pound connector for the trigger pull. They are also available in 10 or 17 round mags for the 9mm, and 10 or 15 round for the 40 caliber.