4UANTUM Magnus Pro MCX Hop-Up Chamber for APFG MCX GBB Airsoft

Machined from a single billet of 6061 aluminum as a one-piece housing, the MAGNUS PRO MCX features our proven self-centering tri-lug design and true TDC adjustment mechanism. In addition to delivering improved accuracy and consistency, the chamber incorporates corrected cycling geometry.

During operation, the chamber interfaces with the bolt carrier rather than the nozzle, helping prevent nozzle damage caused by repeated impact. Because the APFG MCX uses the Hop chamber as part of the barrel-mounting interface, the MAGNUS PRO MCX also improves overall structural rigidity through its stronger, precisely machined construction. The adjustment wheel is easily accessible through the handguard openings, allowing smooth incremental adjustments on the go—without disassembly or dedicated tools.

Installation references:
✔ Compatible Models:

• APFG MCX GBB series (Rattler, Legacy, SPEAR LT, Rattler LT, RSAR, SURG, MCX HUNTER models.)
• BPW MCX GBB series (With APFG MCX GBB system.)

✘ Non-Compatible Models:

• APFG XM7 (SPEAR) GBB (Different HOP-UP design.)
• APFG MPX GBB series (Different HOP-UP design.)
• MCX GBB series from other AIRSOFT brands. (APFG ONLY.)
• non-MCX AIRSOFT GBB model.
• Japan specification AIRSOFT GBB inner barrel/precision inner barrel products may not be applicable or require additional processing before installation due to different design specifications and slots. Including PDI, KM, Laylax inner barrel products, are NOT applicable.