It's pretty easy, actually. You'll only need to mod the ALG hammer before installing the kit per ALG instructions. As you can see in the pics, the receiver for the VEPR has a reinforcement bar across it near the hammer pivot pin. Both the 'tail' on the ALG hammer and the body of the ALG hammer interfere with this pin. Grind the 'tail' off to make the hammer round in the area of the pin hole, and notch the hammer body similar to the factory hammer to clear the pin when the hammer is resting on the firing pin with the bolt forward. My pictures are pre-polishing/painting, so don't bother tel