MINIATURE MASTERKEY SHOTGUN MODEL
UNDER AR BARREL ATTACHMENT | REQUIRES SMALL INSTALLATION
Fits miniature M16 and AR15 Model Barrels
Comes with screw and screw driver. Must remove front sling loop and hand-guards to fit. 
5.25" in length (13.3cm)
1.5" in height (3.8cm)
Preloaded with 3 dummy shotgun shells
Does not fit the short barrel system
Not compatible with AR Drum Mag
100% die cast metal
Installation Instructions:
Remove front sling loop with included screwdriver.
Remove hand-guards.
Remove bracket from Masterkey.
Fit Masterkey under barrel. Front sling loop mount inserts into groove in Masterkey. 
Position bracket over barrel and onto Masterkey and screw into place with long screw. (Smaller bracket for GoatGun M16 attachment.)
Fix larger hand guard into place.
When loading rounds, push dummy shells all the way in using small screw driver provided, or a toothpick or related item.  When cycling, pull firmly to eject round. 

Compatible with M16A1 when using the Grenedier handguard. 
Is your MasterKey jammed?  Use this video below: