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	QB78 and general information?

				QB78 and general information?  Weylan Wang (wwang)  08.22.04 - 02.54 PM  (PDT)
				QB78 information gathered. Information on the QB78 directly This information slightly stale dated 1999, but still relevant. http://olympia.fortunecity.com/kickbox/377/qb78index.html#top There is currently a QB78 in .177 and a QB78 in .22 There is also now a QB78t which accepts a paintball bottle directly like the BS392G but the BS392G only accepts 88 gram airsource. The QB78t is having seal issues in stock airguns and vendors are having to replace the seal before being able to ship the airguns to be reliably useable (8/1/04). Does the QB78 have scope rails? Yes, the QB78 has scope rails. These rails are standard 3/8” or 11mm. How should I store the gun, with or without CO2? Gene Sunday writes: You should store the gun with some pressure, but not empty. It is better for them seals to have some pressure, but too much pressure makes the seals absorb CO2 and then fail. So the answer is shoot the QB78 down, till almost empty or at least where the POI seems to start to shift may be lower, and then put the gun away. It's possible for the valve stem seal to absorb gas and swell. We don't need to purge the QB78 when you put the airgun away, but lower pressure CO2 will help keep the moisture out and reduce swelling. Is the QB78 in .22 the same as the QB22? mikeattwj wrote: The QB 22 was manufactured with parts from the Shanghai Air gun factory but was put together by Tim at Mac 1. He used to put Walther Barrels on them and had his own internal parts. They were faarrrrr superior to just a QB 78. Reasonable working temperatures for the QB78? Reasonable working temperatures for the QB78 are from 55-100. Currently no one has had problems with hot temperatures locking up the airgun, and not allowing you to fire because of too much pressure from to much heat. How many shots? Michaelemelick wrote: He gets 80 shots on 2 cylinders in an untuned gun. Tuned....depends on what type of tune you get I'm running around 40 with a power tune. Tony wrote: 40 full power shots on powerlets, I recently bulked it using Cooper T's Internal Bulk Fill kit(with bleed valve on gun fitting, highly recommended), I have not tested shot count, Cooper T said to expect well over 70, IIRC, more like 100+...I will post once I get around to sitting down and slinging lead over the chrono... Does the QB78 require an airgun scope? Due to the fact that the QB78 is CO2 and not a spring piston airgun, the QB78 is not particular about scopes, because there is little recoil. A scope with an Adjustable Objective (AO) is usually suggested because an airgun generally shoots from 10-100 yards, instead of regular guns shooting from 10-200 yards. QB78 and reverse cocking? DRZ wrote: the original gun the QB was cloned off of - Crosman 160 - was developed in conjunction with input from the NRA as a specific bolt-action rimfire trainer substitute. As such it was felt that Cock-On-Closing was a safer mode than the gun cocking itself every time the bolt was opened. As produced - the gun is "Safe" - until a pellet is loaded and the bolt closed. Far fewer chances for "I forgot" that way. Tunes There are currently at least 3 people doing tunes. Mac-1 http://www.mac1airgun.com/ Gene Sunday http://www.gandlairguns.com/index.html Co2une http://members.cox.net/co2une/index.html Most of the tunes will bring the QB78 into a really nice airgun. Muzzle brake for the QB78 See the muzzle brake for the RWS 350 smooth, not fluted ordered from http://www.straightshooters.com/ or http://www.dnrsports.net See also the note by Rich on how to get the muzzle brake to work. http://www.network54.com/Forum/thread?forumid=324398&messageid=1091576930 Bulk Accessories for the QB78 Funsupply sells a great regular bulk adapter for the QB78 and QB79. This replaces the endcap and allows you to use a CO2 tank to refill the QB78. This is much more economical then powerlets if you are going to shoot the QB78 significantly. Mac-1 (extended bulk tube) and maxzbulk (maxzbulk lite extended tube) sell an extended bulk tube that extends the number of shots and just adds a tube as an addition. CooperT sells a bulk kit for both paintball and extended tube. Maxzbulk also has an adapter that allows you to use a paintball bottle directly. The QB78t is a little different, it allows you to use a paintball bottle directly on the gun. It is like having one of the adapters built right into the gun. One of the other options for using the QB78 on bulk, is to use the Funsupply bulk adapter with a Male QD (quick disconnect) and then use a regular paintball bottle connected to the QB78 using a what is called a CO2 remote. This makes the QB78 lighter and shoot very consistently, because you can use a large paintball bottle stored where ever you want and disconnect it when you are done with very little waste of CO2. This is the way many paintball players make their gun lighter. With the remote hose, the paintball tank can be stored on your waist not on the gun. The CO2 remote can be found for $17 (8/10/2004). Funsupply http://www.funsupply.com/ Maxzbulk http://home.earthlink.net/~maxzbulk/ Cooper T http://www.cooper-t.com/airguns.html Mac-1 http://www.mac1airgun.com/ Stocks for the QB There are various stocks for the QB78. Don Main http://www.geocities.com/airgun177/qb78_stocks.html Technical specs for the QB78 Manual http://www.funsupply.com/airguns/qb78manual.htmL Replacement Seals kit Gen Sunday sells one for $12.50. Mac-1 sells a replacement seals kit also. Gene Sunday http://www.gandlairguns.com/index.html Mac-1 http://www.mac1airgun.com/ Shrouded barrels Shrouded barrels have been imported from England for Mac-1. Mac-1 http://www.mac1airgun.com/ CO2 Notes Check the pin valve of the CO2 tank to be sure it moves smoothly. A stuck pin valve can cause loss of gas on filling the tank, or filling the airgun. Check the O-ring of the CO2 tank for cuts. Information on the CO2 dynamics of used by paintball, but relevant to people using CO2 airguns http://www.warpig.com/paintball/technical/gasses/co2dynamics.shtml How do I fill CO2 reservoir? Filling a CO2 tank can be tricky. Filling the reservoir of the QB78 can be tricky too. The bigger the reservoir on the QB78, the more consistent shooting you get for a longer period of time, because of the more consistent pressure. On filling the reservoir, you need to pre-chill the reservoir to lower the pressure in the reservoir so more liquid gets into the reservoir. Over filling the QB78 is less of a problem in cooler temperatures. But at higher temperatures, really consider not filling the airgun “full”. See CO2 dynamics for dangers of over filling. With this being said, if you over fill the QB78 and fire the gun “soon”, there really is not much of a problem with too much pressure. If you have over-filled the QB78, you will see more “white vapor” escape when you fire the gun until you reach a more reasonable fill. But please, if you think you have over-filled the QB78, fire the gun before the gun warms up too much and the pressure/temperature rises too much. I have found that when filling CO2 tanks, if you put them in the freezer for 10-30 minutes before you fill the tank, you don’t have to waste CO2 gas pre-chilling, because the tank is already cold. See the notes on Bulk CO2 filling here for more detailed information. http://olympia.fortunecity.com/kickbox/377/qb78index.html#top Bulking CO2 accessories to get? For bulking CO2, I suggest you have a number of accessories handy as spares so you can shoot and not have to worry about the repair shop being closed. Being new, you may want to have some of these around incase you make mistakes. • Extra O-rings for the top of paintball tanks. Just incase you blow one. • O-rings of the size for the QD if you use one. • A wrench for tightening the burst disk if it comes loose. • An extra burst disk. • Scale to see how much CO2 is in the gun or CO2 tank. ($30) The more accuracy the better, but most hanging fish scales are really only accurate to +/-10 grams or 1oz. So be careful about how you fill the CO2 tank and plan accordingly. Way to use and shut off Airsourse and stop with tank not empty? Weylan wrote: I have been on a hunt to find a way to use the Airsource 88gram CO2 and be able to shut off the gas to the airgun once I start using it. I hate to leave the airgun under pressure, and if the airgun leaks gas and you have to stop shooting, you loose the rest of the gas from the Airsource. What I wanted was an Airsource to working pin-valve. I can't seem to find that, so I am settling for this. I found a source to get part way to what I wanted so that if you use Airsource you can at least turn the Airsource off, if not have a working pin-valve. The adapter is about $14. It goes onto a paintball ASA threads and has ASA threads on top with a on/off in the middle. See http://www.paintball-discounters.com/cgi-bin/webc.cgi/st_prod.html?p_prodid=1671&p_catid=136&sid=5bW2dL0-o0YTBuZ-21104336824.88 This would allows us to use Airsource, and turn the gas off when you are done and not leave the airgun charged. What you have to have is the on/off adapter, then the Airsource to ASA paintball, then the Airsource tank. The adapter is 5.5 oz, so does not weigh that much. Now you can also refill the Airsource container too if you have that on/off valve to ASA. This would be great for the QB78t or any CO2 gun with a remote. This would work for also filling a QB78 in the field, from actually any small tank. Cold weather shooting with the QB78 using HPA? Cvanmeter wrote: I use a 3000 psi Paintball HPA Tank that has a built in non-adjustable regulator that only allows 850 PSI to exit. I constantly feed from this tank via a Paintball Remote Hose into the QB's Bulk fill adapter. If I just fill the QB then disconnect, I only get a few full power shots due to the characteristics of compressed air vs. Co2 Also, it is my understanding that typical bulk Co2 tanks and Powerlets are in the neighborhood of 850 psi on average warm day. So it works great for bench shooting but requires you carry the tank via a paintball remote tank belt if taken out in the field. It may be a bit cumbersome, but it allow for cold weather shooting that I can't do via Co2 as it is consistent in most any temp. As you know, to make it a PCP where the high pressure of 3000 psi is stored in the gun itself, would require a new storage cylinder be installed on the gun designed for that pressure and some small internal changes This is roughly a $150 solution allowing you to shoot in cold weather(below 50) with the QB78 without problems. A 44cu inch tank is roughly the equivalent to a 12oz CO2 tank. This Post was last Modified by spiderLiz - 08.23.04 - 05.41 PM  (PDT)

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