Post by Jeff on Nov 1, 2013 9:37:10 GMT -5
I've always used green gas/propane in our KWA pistols, without incident. We recently purchased the Marui M870, and for the first time, I'm tempted to heed the warning to use 134a/duster gas, at least in part.
With green gas the TM shoots a consistent 345 fps, and with duster gas it shoots ~245 fps. I like the anticipated durability associated with using the "proper" or recommended gas, but I also want the extra 10 to 20 shots (or 30 to 60 BBs down field with the 3-round burst) that we seem to get by filling the removable tank with green gas instead of duster gas. An extra 2 shells per tank seems significant to me.
After an evening of experimenting (lots of 3 and 6 round bursts at targets, etch other etc.), I have some anecdotal information from with I think inferences can be drawn. First, it seems that "blending" the 2 gasses gives a blended performance result. Second, a 4 to 1 fill ratio of duster gas to green gas causes the performance differential to be halved (e.g., the M870 will shoot just under 300 fps and awill power at least one additional shotgun shell).
I achieve the "ratio" by first adding the duster gas (e.g., for 8 seconds) and then the green gas (e.g., for 2 seconds). I recognize this process probably doesn't result in a gas volume ratio of 4 to 1, so it's more of a temporal-fill ratio. In the end, I was simply seeking a repeatable process that would deliver a level of performance that was in the "middle" of that delivered by each gas.
Some questions for those who are uber-experienced with gas-based replicas: Is blending the gasses safe? Did I just get lucky with what we had at the house, or are there certain types of duster gas that blend better with green gas? Other than the hassle of bringing 2 cans out to a field, is there a reason I never see folks blending gas?
I appreciate the feedback.
With green gas the TM shoots a consistent 345 fps, and with duster gas it shoots ~245 fps. I like the anticipated durability associated with using the "proper" or recommended gas, but I also want the extra 10 to 20 shots (or 30 to 60 BBs down field with the 3-round burst) that we seem to get by filling the removable tank with green gas instead of duster gas. An extra 2 shells per tank seems significant to me.
After an evening of experimenting (lots of 3 and 6 round bursts at targets, etch other etc.), I have some anecdotal information from with I think inferences can be drawn. First, it seems that "blending" the 2 gasses gives a blended performance result. Second, a 4 to 1 fill ratio of duster gas to green gas causes the performance differential to be halved (e.g., the M870 will shoot just under 300 fps and awill power at least one additional shotgun shell).
I achieve the "ratio" by first adding the duster gas (e.g., for 8 seconds) and then the green gas (e.g., for 2 seconds). I recognize this process probably doesn't result in a gas volume ratio of 4 to 1, so it's more of a temporal-fill ratio. In the end, I was simply seeking a repeatable process that would deliver a level of performance that was in the "middle" of that delivered by each gas.
Some questions for those who are uber-experienced with gas-based replicas: Is blending the gasses safe? Did I just get lucky with what we had at the house, or are there certain types of duster gas that blend better with green gas? Other than the hassle of bringing 2 cans out to a field, is there a reason I never see folks blending gas?
I appreciate the feedback.
