The Green Gas Magazine for P320 M18 (21 bb) produced by VFC / SIG AIR ProForce is the original spare part with a compact profile for your standard-issue pistol. Unlike the extended version, this model features a flat (short) base that fits flush with the grip, reducing bulk and maintaining a very clean line. Constructed of robust metal (278 grams), it holds 21 BBs and guarantees excellent gas seal. Thanks to the "Dual Power" system, it is perfectly compatible with both the M18 and the M17 (also to convert CO2-native models for summer use). Available with Black or Coyote Tan base!
This is an approximate conversion table to help you find your size. If you have already purchased an item from our brand, we recommend you select the same size indicated on its label.
| International | XS | S | M | L | XL | XXL | XXXL |
|---|---|---|---|---|---|---|---|
| Europe | 32 | 34 | 36 | 38 | 40 | 42 | 44 |
| US | 0 | 2 | 4 | 6 | 8 | 10 | 12 |
| Chest Circumference (inches) | 33-35" | 36-38" | 39-41" | 42-44" | 45-47" | 48-50" | 51-53" |
| Chest Circumference (cm) | 84-89 | 91-97 | 98-104 | 107-112 | 114-119 | 122-127 | 129-134 |
| Waist Circumference (inches) | 28" | 30" | 32" | 34" | 36" | 38" | 40" |
| Waist circumference (cm) | 71 | 76 | 81 | 86 | 91.5 | 96.5 | 101.5 |
LOWA FOOTWEAR SIZE CHART
SIZE SELECTION:
THE SIZES IN THE DROP-DOWN MENU ARE UK SIZES (ENGLISH)
conversion chart: UK size - (IT size) - size in mm
Size 6.5 (40) 257mm
Size 7 (40 3/4) 262mm
Size 7.5 (41.5) 266mm
Size 8 (42) 270mm
Size 8.5 (42.5) 274mm
Size 9 (43 1/4) 278mm
Size 9.5 (44) 283mm
Size 10 (44.5) 287mm
Size 10.5 (45) 291mm
Size 11 (46) 295mm
Size 11.5 (46.5) 300mm
Size 12 (47) 304mm
Size 12.5 (48) 308mm
Size 13 (48.5) 312mm
NEED ADVICE ON CHOOSING A SIZE?
Take one of your sneakers and look at the size in mm or cm, look at the diagram above to see what it corresponds to and order your size!
e.g., your sneaker is 27.2 cm long? Great, the closest and most correct size will be: "TG 8.5 (42.5) 274mm", in the purchase menu select size 8.5UK!
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Compact Profile, Same Reliability:
Designed under official SIG SAUER license for the ProForce line, this magazine represents the standard (Flush-Fit) configuration of the P320 platform. The flat polymer base closes perfectly flush with the base of the grip: this means zero protrusions, less risk of snagging on equipment, and a profile much more suitable for those who play in CQB or prefer a leaner setup. Despite its compact size, the capacity remains a good 21 6mm caliber BBs.
VFC Quality and Cross-Compatibility:
Weighing 278 grams, the solid metal body gives the replica exceptional tactile realism and promotes rapid (drop-free) dropping during emergency magazine changes. VFC's high-efficiency valves optimize Green Gas consumption, returning a crisp, powerful blowback. Perfectly interchangeable: you can use it on both the compact M18 and the full-size M17 without any feeding or engagement issues.
Long or Short? Choose your Setup: The choice between this (short) magazine and the M17 (extended) one depends on your playing style. If you use very tight or Velcro-closed magazine pouches, the flat base of this model will slide in and out much more easily, avoiding annoying tactical snags.
The "Summer Cure" for CO2 versions: All VFC P320s on the market have a "Dual Power" mechanism that digests both CO2 and Gas. If your replica was born with CO2, you know how aggressive it is in the summer: high temperatures cause the pressure to skyrocket, risking breaking the air nozzle and sending you out of Joule limits. Buying this Green Gas magazine allows you to lower the pressures in the hot months, playing in total safety and preserving the life of your M18/M17!
Don't press that valve! A classic mistake of beginners is to empty the magazine at the end of the game by pressing the vent valve button. By doing so, the residual gas instantly freezes the rubber O-Rings, drying them out and causing them to break. At the end of Sunday, always leave a small charge of gas inside the magazine: the pressure will keep the components sealed and lubricated ready for the next adventure.
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