6mmProShop CO₂ Magazine — KWA PTS LM4 Series (500 FPS Version) — 38-Round High-Flow CO₂ Mag

Push your GBB platform into extreme performance territory with the 6mmProShop CO₂ Magazine for KWA PTS LM4 series (500 FPS version). Built for advanced users and high-power builds, this magazine pairs rugged construction with a high-flow valve to deliver hard-hitting, consistent CO₂ performance. If you’re running reinforced internals and chasing the crisp blowback and higher terminal energy CO₂ is known for, this mag gives you the reliable feeding and durable build quality you need for aggressive play and serious training.

Built strong for high pressure

This mag is engineered from heavy-duty metal alloy and reinforced polymer, placing strength where it’s needed while keeping overall weight manageable. Precision molding and reinforced alloy components minimize deformation under stress so the mag keeps feeding reliably shot after shot. The textured magazine case provides a secure, non-slip grip for fast reloads in wet or gloved conditions — a small detail that pays dividends in high-tempo CQB or milsim scenarios.

High-flow performance tuned for 500 FPS

Unlike standard CO₂ magazines, this version features an integrated high-flow valve designed specifically for high-power rifles. The valve allows greater gas throughput for faster bolt cycling and stronger blowback, delivering the elevated FPS range you’re aiming for while maintaining repeatable performance. When paired with an LM4 platform that has reinforced internals, this mag can push chrono into the ~500 FPS window (actual results vary with ambient temperature, BB weight, and rifle setup).

Practical, field-ready features

• Removable base plate conceals the CO₂ screw for quick gas changes while protecting the valve from dirt and accidental adjustment.

• Heavy duty, reinforced feed lip prevents spread and deformation under the high tension required for consistent feeding.

• High-tension follower spring ensures dependable BB presentation and reduces misfeeds under high cyclic rates.

• 38-round capacity balances realistic magazine feel with compact handling for LM4-style rifles.

These features combine to give a magazine that isn’t just powerful — it’s built to be used.

Compatibility & fitment

Specifically designed for KWA PTS LM4 series gas blowback rifles, this magazine will also fit other compatible GBB platforms that share LM4-style geometry. Always verify fitment for your specific rifle model before purchase to ensure smooth insertion, feed, and lock-back performance.

Important safety & maintenance notes (read carefully)

• Recommended for advanced users only. CO₂ operates at significantly higher pressures than green gas; using CO₂ at this power level places substantial stress on your rifle’s bolt, slide, and internal components.

• Not recommended for stock guns. To avoid accelerated wear or catastrophic failure, upgrade to reinforced internal parts (stronger hammer, sear, bolt, nozzle, and associated components) before prolonged use.

• Warranty caution: Modification of green gas and CO₂ magazines to accept aftermarket HPA fittings or high-pressure valves will void all warranties and can create dangerous conditions. Do not attempt HPA conversions unless the product and your platform are explicitly rated for it.

• Maintenance: Keep O-rings lubricated, inspect seals regularly for wear, and replace worn parts promptly to avoid leaks and inconsistent performance. Store CO₂ magazines in a cool, dry place.

Who should buy this mag?

This high-flow 6mmProShop CO₂ magazine suits advanced players, competitive trainers, and milsim teams who already run reinforced LM4 platforms and want the visceral blowback, rapid cycling, and higher impact energy of CO₂ at near-DMR velocities. If you run upgraded internals and want a magazine that complements a heavy-duty build, this is a top choice.

Quick specs

• Manufacturer: 6mmProShop

• Type: CO₂ Magazine (High-flow, 500 FPS version)

• Compatibility: KWA PTS LM4 series & compatible GBB rifles

• Capacity: 38 rounds

• Construction: Heavy-duty metal alloy + polymer, reinforced feed lip

• Gas Type: CO₂

• Color: Black

Summary: The 6mmProShop 500 FPS CO₂ Magazine for KWA LM4 is a purpose-built, high-flow feed mag for serious players who demand extreme performance. Rugged construction, reinforced feeding components, and a concealed CO₂ base plate make it a durable, field-ready option — provided it’s used with the appropriate reinforced internals and by experienced users aware of CO₂’s demands.