The sumo handle works with the MI mount. The bolt retaining paracord was sized for the factory handle. I did not have to readjust it for the Sumo handle.
The paracord is there to protect the optic in case of an accidental unlatching of the bolt. The sump bolt handle does in fact hold open like the factory one.Is the strap on the sumo handle to prevent it from hitting the optic? Without the mi optic mount, will the sumo handle lock back like the stock one?