The One Piece Full Length Guide Rod replaces your stock recoil guide without pistol modification. Assembly and disassembly are the same as with stock components (however a bushing wrench is required). Some shooters are in the habit of moving the slide back slightly to remove the barrel bushing this is not possible with a one piece guide rod. Note: Wilson Recommend using Barrel Bushing Wrench with this product. CAUTION: Safety glasses should be worn at all times when replacing or working with firearm springs. Failure to follow this safety precaution could result in bodily injury.