Mecanica 6mm share their findings on the Rossi Neptune DMR AEG, a rifle with metal and polymer construction, a comfortable and versatile ambidextrous stock, and a Picatinny rail system for mounting tactical accessories. The 12-inch Picatinny handguard allows for customization, while the adjustable and foldable handle and front sight provide precise aiming in various game conditions.

6mm Mecanica did some custom work on the M4 QGK Yankee FM-01 AEG, explaining the custom parts and the paintjob they did... "Right after the QGK M4 was thrown into the water (review link below) we rushed to the workshop to redo - as quickly as possible - the entire maintenance process and a cleaning in the composition of external parts of the equipment.
Customization was also made. There's the result!

The spray paints used are from the MTN brand (Montana):