While this double trigger mod does not inspire me to rush out to order one it claims to have lots of benefits:
- The lower trigger has a pull weight 50 to 60 percent lower than that of a standard trigger
- It fits any mil-spec AR-15 with a removable trigger
- The reduction in trigger weight makes precision shooting easier
It was also inspired by a paintball device, fwiw. At any rate something like this is pretty much like adding a BAD lever to your AR- in the sense that once you add one you have officially changed your firing mechanics.