Picked up a Troy low profile gas block to put a long free float on. Put on the gas block and the rifle wont cycle. When I put on the old DPMS gas block, it cycles just fine.

The only functional difference I notice is that the Troy low pro gas tube hole is drilled all the way through the block. I notice there is some discharge forward from the gas block. Am I losing too much pressure through this front outlet to cycle? What is the solution?