A great guy named Steve (DATA at the Aliens Legacy) was kind enough to offer some custom machined components to aid in connecting the Maruzen M870 to the SPAS-12 pump grip. This morning I quickly assembled them to check the fit.
As you can see above, everything goes together perfectly. The machining he did on these parts is top notch and I'm really happy with how they work. As a side note, you can just barely see the groove/channel I put into the M870 receiver to make it slide into the SPAS-12 cage. Below you can see the parts as I received them:
The racking arms are OEM parts that have been trimmed down to the proper length to fit inside the grenade launcher. There's a curved band that connects the two arms as well as providing a mounting point for the aluminum key (oval shaped piece). Finally, the small rectangular plate with counter sunk hex screws to attach the pump grip to the racking assembly. Stay tuned for the final G/L assembly.
