and is put directly into the shotgun by the trigger assembly

Gearbox Reinforced:Re-inforced version 2

Inner Barrel: 280mm

You can not go wrong with these 6mm

and quality built

LayLax MP5 Picatinny Rear Stock Base Set 0.20 g and is put directly intoMP5 Picatinny Stock Base Buffer Tube Adapter Set20mm Picatinny Stock Base and Buffer Tube Adapter SetUnlimited customization options with the M4 buffer tube conversionFreely adjust the height for the best sight lines when aiming! Designed to make your favorite MP5 even more compact, lightweight and enables even more interfacing options. The LayLax picatinny 20mm stock base brings the highly customizable attachment 20mm platform to the rear of the gun