Board Thread:General Nerf discussion/@comment-43428212-20190824223423/@comment-27306930-20190830012737

Ah yes, the go-to mod for the Rough Cut. Those are actually pressure balancing vents. Each time you fire the RC2x4, air has to pass through another set of air restrictors in the Smart-AR, further reducing the power with each subsequent shot.

The vent holes reduce the pressure on the first two shots so they're roughly equivalent to the second set of shots. Once you cover them you'll find the first two shots are much improved, and the second set of shots is just normal.

Unfortunately, the rack and pinion priming system is a little fragile, so doubling the spring can be problematic. I can personally vouch for the 4x2 mod, and the NIC loves the masterkey mod. Other than that, your choices are somewhat limited.