Since I'm using a remington hammer and sear in my build I will need to make some blocks to hold the sear, hammer and hammer spring + plunger in position. I started with my solid block and rough cut out the two blocks as shown in the drawing. They are on 1/4" scale paper (I traced them and cleaned them up a bit). The new remington trigger groups are made of plastic so I used mild steel for these blocks which seems to hold up just fine. The front block has a lowered and smaller lug to prevent the insertion of an unmodified trigger group in the finished build. This pattern is for the 870 hammer and sear, which will work, but will require some fitting for the slightly different 742 hammer and sear for this build. Lastly is a picture of how the fire control system will be layed out. The completed set of blocks I hacksawed/filed out, and the profiled ones I milled.