Improve the accuracy of your 1911's stock barrel by adding a Dwyer "Group Gripper". The "Group Gripper" is a modified recoil spring guide and barrel link that uses heavy spring tension to force the rear of the barrel up into the locking lugs in the slide. The result is your pistol goes into battery exactly the same time, squeezing the utmost accuracy from your stock barrel. Combined with a #29 target bushing for a simple and inexpensive accuracy job. Minor parts fitting may be required. NOTE: We Recommend using our #22 or #22P Barrel Bushing Wrench with this product.