Since I started collect shotguns for three years, I did all the fix and modify by myself, and I've been owning Hwashan, Maruzen, Marushin, APS and Marui, but not Tanaka(discontinued). Luckily I had a chance to modify a legend piece, the "Tanaka M870" to fulfill my airsoft Shotguns desire! Here is something I would like to share what I'd learned from them. That may take a bit long time to complete this post. Please be patient if you are interested in reading this. If you have any idea would like to share, please feel free to do so, thanks.
the following details on each items will be parts listing with pictures, modify and functional test with video if any.
Reference Chart:
Difficulty for modify
D1 - easy drop in
D2 - a bit file work
D3 - needs tools/drill and file work
D4 - needs precise file work
D5 - needs precise tools/drill and file work
Rating for gaming
R1 - Good for collection
R2
R3 - Good for both collection and gaming
R4
R5 - best for gaming
Gas Shotgun Showcase:
Tanaka M870
Marushin Mossberg
Maruzen M870
Marui M870
APS CAM870 pistol grip
Maruzen M1100 revision
Hwashan Double Barrel
Remington M870
