American National Firearms second generation ""Tungsten Tactical Pro G2"". At a whopping 2 ounces, the American National Firearms second generation, Tungsten Tactical Pro G2 is even better than the original. The Tungsten Tactical Pro G2 is the ultimate match guide rod for IDPA, IPSC, USPSA or any other competitive shooting sport that requires rapid, accurate shot placement. More weight, greater stability, superior performance. Governed by the laws of physics, the advantages of using a heavier guide rod are indisputable - and so are the results - tighter groups, faster follow up shots and reduced fatigue. With a Mil-SPEC stainless steel chassis and a heavy tungsten core, the new Tungsten Tactical Pro G2 guide rod for the Sig Sauer M11-A1, P228, P229 (all calibers) and P250 Compact (9mm, 357SIG, &40S&W only) is twice the weight of a solid steel guide rod and more than 4 times the weight of an original Sig hollow metal rod. The greater mass at the front of the gun is more resistant to a change of motion when shooting, which helps to tame recoil and get your sights back on target quickly. With this decrease in muzzle flip, follow up shots can be placed swiftly and with more accuracy, while the moderation of felt recoil (due to the greater inertia) translates to a reduction in shooter fatigue. In short, you will shoot more quickly, more accurately and for a longer duration before fatigue and shaking begin to interfere with performance. The tough stainless steel exterior ensures long term durability; it will not chip or break. The Tungsten Tactical Pro G2 is guaranteed for life. This guide rod will fit the standard M11-A1, P228, P229 (all calibers) and also the P250C (Compact) chambered in 9mm, 357SIG, and 40S&W with traditional ""non-captured"" springs. This guide rod will not fit the P250F (Full size), the P250 Sub-compact, or the P250C Compact chambered in .45ACP.