Crosman 1377/22 5.5mm Breech Riser

thingiverse

This is a design for a breech riser that fits standard steel breeches, requiring only a longer hammer pin, dremel bits of exact diameter, vinyl tubing for the TF port, and an m3 thread screw. To prevent the bolt from obstructing it, machine and chamfer an m3 bolt to fit inside the breech. With these modifications, you can add your own barrel shroud without compromising its center alignment. It's advisable to print this riser in ABS plastic for better results. I have since updated the design to make it easier to print on a build plate. Additionally, I modified the shape to enhance the security of the breech riser sitting on the main tube and the breech itself.