Airsoft Canada - View Single Post - WETTI/AWSS - M4/SCAR/HK416

m102404 · September 20th, 2010, 09:46

What Gas to Use

Propane vs. "duster" vs. CO2

NOTE: The following info is not solely my own...it's a compilation of the info from various previous posts

In general, the WE platform was designed to run on green gas (i.e. propane). Calls from the public asked for a harder recoiling system...so they built a CO2 mag and made some changes to the nozzle design (i.e. the flanged vs. the bottle neck design). Other than that there aren't any material differences between any of the pre-CO2 and CO2-ready models. That said...the faster/harder recoil speeds of C02 really put a beating on the rifles. Most notably the SCAR's design of a very heavy bolt with plastic parts cannot take sustained wear and tear on CO2.

Out of the box velocities are all over the place...from lows of 340fps on propane to highs of 590fps. It's dependant on the position of the float valve. So you MUST chrony yours to see what it's shooting.

Duster gas will drop the velocities but it's not a guarantee that it'll reliably cycle your rifle...nor does it lubricate anything.

In general...the concensus is to use the gas that results in the most consistent operation....and use an adjustable nozzle system to tune the velocity.

- M4 A1, 363 tightbarrel, Using Xcortech chrono, goldenball BBs, 1st shoot is =520, 2nd =545, 3nd = 575, 4th = 671.9?? Can this happened ? but then back to 520 - 545 fps...I'm using 195psi gas ( guarder black is 150psi )...

- I was using a CO2 magazine and it's firing at 530fps with .2g which seems to be 2 fast to get the bolt catch to catch. The propane mags firing at 430fps with .2g are catching. Guess I'll just have to wait for the npas valve

- The NPAS is the way to reduce the FPS. Also if your Scar has a Steel Nozzle it's rated for C02 if it's brass then it is not.

September 20th, 2010, 09:46	#421
m102404 Tys Trader rating Join Date: Apr 2006 Location: Toronto	What Gas To Use What Gas to Use Propane vs. "duster" vs. CO2 *NOTE: The following info is not solely my own...it's a compilation of the info from various previous posts* In general, the WE platform was designed to run on green gas (i.e. propane). Calls from the public asked for a harder recoiling system...so they built a CO2 mag and made some changes to the nozzle design (i.e. the flanged vs. the bottle neck design). Other than that there aren't any material differences between any of the pre-CO2 and CO2-ready models. That said...the faster/harder recoil speeds of C02 really put a beating on the rifles. Most notably the SCAR's design of a very heavy bolt with plastic parts cannot take sustained wear and tear on CO2. Out of the box velocities are all over the place...from lows of 340fps on propane to highs of 590fps. It's dependant on the position of the float valve. So you MUST chrony yours to see what it's shooting. Duster gas will drop the velocities but it's not a guarantee that it'll reliably cycle your rifle...nor does it lubricate anything. In general...the concensus is to use the gas that results in the most consistent operation....and use an adjustable nozzle system to tune the velocity. - M4 A1, 363 tightbarrel, Using Xcortech chrono, goldenball BBs, 1st shoot is =520, 2nd =545, 3nd = 575, 4th = 671.9?? Can this happened ? but then back to 520 - 545 fps...I'm using 195psi gas ( guarder black is 150psi )... - I was using a CO2 magazine and it's firing at 530fps with .2g which seems to be 2 fast to get the bolt catch to catch. The propane mags firing at 430fps with .2g are catching. Guess I'll just have to wait for the npas valve - The NPAS is the way to reduce the FPS. Also if your Scar has a Steel Nozzle it's rated for C02 if it's brass then it is not. Last edited by m102404; September 24th, 2010 at 09:13..