Drop in straight into better groupings. This prebuilt barrel assembly pairs a precision Real Deal Airsoft 260mm 6.02mm tight-bore inner barrel with a machined Retro Arms basic CNC hop-up unit and a matched 4UAD bucking + nub — all assembled and tuned for reliable performance in MK-18 style platforms. The combination reduces hop-inconsistency and minimizes air turbulence around the BB, giving you tighter, more predictable shots without extra fiddling.
Ideal for players chasing improved FPS-to-accuracy balance on mid-length barrels (perfect for carbines and CQB-tuned MK-18 builds). The CNC hop-up delivers smooth, repeatable adjustment while the 4UAD bucking provides a consistent contact surface and improved spin control for heavier or precision BBs.
