No need for extra valve retention.
|April 19 2012, 5:27 PM |
There is a large thick steel ring inside the tube that takes the front action screw from the top and the stock stud from the bottom. Both are pretty beefy screws. The valve butts up against this steel ring. Valve is not going anywhere.
Are a lot of posts on bulk filling so can look up a lot of information from this forum.
Just hooking up the tank and opening the valve will get some co2 into the gun, but not very much.
Basically, co2 has to have a reason to flow from the bulk tank to the gun. The reason would be temperature. If the gun is a good bit cooler than the bulk tank, will get a pretty full fill.
Rifle is really too big to cool down in a freezer. But you can vent the last bit of the first fill (or shoot very quickly) to cool the gun down enough so that the next bulk fill is a pretty good one. I've even placed ice cubes on the gun's tank in the summer to cool it down enough to take a better fill.
Co2 is filled by weight. So if you were to put the gun on a scale before a fill and find it coming in at 7pounds 6.2oz. and then put it back on the scale after a bulk fill and find it comes in at 7 pounds 7.5oz., then you put in 1.3oz. of co2 (are 28grams to the ounce, so 1.3oz is about 3 12gr. worth).
A simple field fill, where the bulk tank and the gun are nearly the same temperature, might get in about 1 oz. Gun cooled by venting/dry firing the last of the gas or by ice cubes might get in 1.3-1.4oz. Really work at it, and you might get in 1.6-2oz.
So how many more shots?... well, consider that a two 12gr. = 24oz. If you got in 1.7oz., would be grams....or about 2 times as much gas...so about 2 times as many shots.