I replaced the sights on my Sig 1911-22 conversion kit due to the stock sights being plastic, cheap looking, and shooting very high. These Dawson sights came with detailed instructions and tools. Price is right. I had to use care installing due to the soft zinc type metal Sig/GSG uses on their slides. I did have to dress the sights with a file just like the Dawson video showed. Once installed, the gun was still shooting 5 inchs high holding at six o-clock. I called Dawson about their perfect impact guarantee and Mike had a taller front sight mailed out that afternoon. Customer service was friendly, efficient and easy. Great upgrade to my .22 conversion kit. 5 stars. Will buy again with out hesitation.