CAA Tactical - Polymer Magazine Coupler CAA Tactical - Polymer Magazine Coupler
Specification:

Fits M16 style magazines & Rugger Mini-14.
Each magazine can be placed in a different height.
Wide enough between the magazines - makes it easy to reload.
Very slim shape & very light.
Will not scratch or deform magazines.
Screw tightened.
No Gunsmith required.
Mil-standard.
Warranty: 10 years.