Videos tagged with DI vs Gas Piston

This video provides a thermal analysis comparing Direct Impingement (DI) and Short Stroke Gas Piston systems using the Brownells BRN-10 and FN SCAR-17. Thermal imaging reveals that DI systems, like the BRN-10, vent hot gases directly into the action, leading to higher internal temperatures. In contrast, the SCAR-17's piston system localizes heat at the gas block, keeping the bolt carrier group and receiver cooler during sustained fire. The comparison highlights the trade-offs between DI's lighter reciprocating mass and piston systems' cleaner, cooler operation.