This Strike Industries Barrel is made for Standard length and the Sig M17. This is an aggressive spiral fluted Strike Barrel that comes as a premium upgrade to your P320 pistol. From the pre-hardened 416 stainless steel to the extreme tolerances, this nitrided barrel has a very high tensile strength and is very resistant to corrosion. From its fluting, there is also a weight reduction without any sacrifice of accuracy or durability - creating a union between match grade performance and unsurpassed reliability. The Strike Barrel for Sig P320/M17 is the ultimate performance enhancer and with features like its crowned tip that goes flush with the slide, it's sure to be the highlight of any Sig pistol build. It's also a prime example of superior harmony between aesthetics, performance, and function. FeaturesAggressive fluted designBlack Nitride CoatingMade of pre-hardened 416 stainless steelCompatible with M17 and slides w/o loaded chamber indicator