Originally Posted by tdeal823
No problem. I'm not Brian D.
, but I thought I could help. Hope you/he doesn't mind my two-cents, too.
"Green Gas" is what the Far-Easterners call common propane. The bottles were either intentionally or unintentionally mislabeled - for reasons that none of us knows (but we all know it caused tremendous confusion in the earlier days of airsoft here in the US...I know I was one of the ones duped, as I wrote a bunch of early info. about the various airsoft gasses based on the R22/HCF(C)22/HFC134a/etc., as the way the bottles were labeled, without having had access to independent analysis of the chemistry). This post on the Airsoft Innovations website is very informative ---> Green Gas is Propane | Airsoft Innovations
I don't do large-volume airsoft shooting anymore, so I'm happy to simply buy commercial "Green Gas" (compared to my shooting hobby expenditures, it's just a drop in the bucket
) or to pick up "duster gas" (HFC134a), since I still have one of those "duster gas canister" adapter nozzles from the old-days, mainly due to the ease of dispensing (into the replica). If you're going more high-volume shooting, the propane adapter - given how common American household has a large propane tank in-residence - will definitely be worth its minimal cost.
In terms of how the replica operates, in most cases of "Gas Blow Back" replicas the magazine is the heaviest single component, which is a metal ("pot-metal," as we Americans know it) pressure-vessel that contains the low-pressure liquid-gas propellant. The mechanical cycle is explained well in this old write-up by my friend and noted UK airsoft enthusiast Just Pistols
- Just Pistols - Airsoft Terminology
- which bases his expo. off of the renowned Western Arms "Magna Blow Back" system of the '90s-early '00s.
As to how to fill up the magazine, YouTube videos such as these - Airsoft: How to Put Airsoft Gas in a Gun - YouTube
- show the technique. I'm old-school, so I just blast away at the magazine until I get "backwash" out of the valve, and I stop. I still have all of my magazines - and they're all perfectly functional - from when I was active in airsoft (starting in '99), so you do the math.
Some magazines have the fill-port/nipple exposed, others hide it away under the floor-plate of the magazine, which can be moved out of position to accomplish the fill. Although metal, you'll need to realize that these magazines are first made of "pot metal" that is not nearly as durable as higher-grade metal. Similarly, their weight approaches or exceeds that of a fully-loaded firearms magazine, so a drop to your home's hardwood floor is not recommended, if you want to keep your spouse happy. At the same time, dropping it onto the concrete of the unfinished portion of your basement or your garage is also similarly not advised for fear of damage to the magazine: at costs that typically equal or exceed that of their real counterparts (well, back in the days when you could get a high-capacity Glock magazine for less than $20
), damage to the pressure-vessel walls will mean that you'd have to obtain a new magazine outright or even try to source appropriate o-ring/gasket seals (not always easy, given that some of the seals are squares/rectangles).
, if you want to practice trigger control, you'd do better either with an established dry-fire regimen or with a dedicated trainer gun that more closely approached or mirrored the trigger of your firearm (i.e. for Glocks, the SIRT or the aftermarket resetting trigger). My airsoft Glock 18C is highly modified, and it nowhere even approaches the trigger feel of my real Glock. Although I've gotta say, the only thing I real difference I noticed when shooting a real Glock 18 on full-auto this summer? recoil.
My years of skirmish play with the airsoft G18C prepared me well for the cyclic violence that's the Glock 18.