WALLET-DRAINER: Tac-Con 3MR & Slide Fire Stock On The Same Gun

If you have tons of money to burn on aftermarket parts and ammo, you can combine a Tac-Con 3MR trigger system with a SlideFire stock and get a pretty decent legal approximation of fully-automatic fire in a semi-automatic AR-15. Essentially, they are two bump-fire devices that seem to be working off one another.