Bottle is usually a 200bar bottle fitted with a regulator set at 1000psi.
Two burst discs will confirm its a regulated bottle.
Bottle neck should state working pressure.
No burst discs may indicate a co2 bulk fill bottle.
I have been given a QB78 that has been converted to air , the shop took it in and have found it was leaking .I have now fitted a set of seal but im not sure what is the safe filling pressure.
.22 Venom Mach 1 (FAC) 6-25x56 Millett.
.22 Venom Mach 2 Thumbhole 6.5-20x40 Leupold EFR.
.22 Venom Mach 2 Sporter 4-12x40 Leupold.
.177 Venom Vantage 4-16x50.
.177 Venom Daystate 8-32x56 AGS.
.22 Venom Datstate 4-16x56 AGS.
.22 Webley Venom FX2000 6-18x40 Busnel Legend.
.177 Titan MPT by Steve Pope 6-24x40 Tasco.
.177 Pro-Sport 4-16x50.
.22 Webley FX2000 3-9x33 Leupold EFR.
.177 Logan Solo 4-16x50.
.22 HW90 (spring powered) 4-16x50
.22 Gamo Stutzen.
.177 Walther lever action.
Bottle is usually a 200bar bottle fitted with a regulator set at 1000psi.
Two burst discs will confirm its a regulated bottle.
Bottle neck should state working pressure.
No burst discs may indicate a co2 bulk fill bottle.
Repariere nicht, was nicht kaputtist.
As has already been stated, we need to know more. If it has still got the original gas chamber then it is only safe to about 1000psi.
At 26 C the CO2 is already at 860 p.s.i. and at 30 C at over 1000 p.s.i. So the QB78 would have a safety factor allowed when used in hot countries. Using HPA at low pressure is not very efficient as the pressure drops very quickly on each shot, and velocity drops. The best way now that it has a bulk filling connection is to use bulk fill CO2 from a fire extinguisher as you are filling with liquid CO2 which will last for many shots. Tried it with my 111, very few shots compared with CO2.
Baz
[IMG][/IMG]
[IMG][/IMG]
Last edited by Benelli B76; 19-03-2023 at 08:13 AM.
BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD
found that interesting
Last edited by venoman; 19-03-2023 at 10:12 AM.
.22 Venom Mach 1 (FAC) 6-25x56 Millett.
.22 Venom Mach 2 Thumbhole 6.5-20x40 Leupold EFR.
.22 Venom Mach 2 Sporter 4-12x40 Leupold.
.177 Venom Vantage 4-16x50.
.177 Venom Daystate 8-32x56 AGS.
.22 Venom Datstate 4-16x56 AGS.
.22 Webley Venom FX2000 6-18x40 Busnel Legend.
.177 Titan MPT by Steve Pope 6-24x40 Tasco.
.177 Pro-Sport 4-16x50.
.22 Webley FX2000 3-9x33 Leupold EFR.
.177 Logan Solo 4-16x50.
.22 HW90 (spring powered) 4-16x50
.22 Gamo Stutzen.
.177 Walther lever action.
.22 Venom Mach 1 (FAC) 6-25x56 Millett.
.22 Venom Mach 2 Thumbhole 6.5-20x40 Leupold EFR.
.22 Venom Mach 2 Sporter 4-12x40 Leupold.
.177 Venom Vantage 4-16x50.
.177 Venom Daystate 8-32x56 AGS.
.22 Venom Datstate 4-16x56 AGS.
.22 Webley Venom FX2000 6-18x40 Busnel Legend.
.177 Titan MPT by Steve Pope 6-24x40 Tasco.
.177 Pro-Sport 4-16x50.
.22 Webley FX2000 3-9x33 Leupold EFR.
.177 Logan Solo 4-16x50.
.22 HW90 (spring powered) 4-16x50
.22 Gamo Stutzen.
.177 Walther lever action.
it's bulkfill co2 not air i'd say and SHOULD NOT BE FILLED WITH UNREGULATED AIR ABOVE 1100PSI-they start to get valve lock around 1250psi anyway
you can get pcp tubes but without much alteration the 78 isn't suitable for air unless it is regulated fed by a paintball bottle or similar
if it's a std length cylinder it will just have the cap which could be a converted original a Gmac one a Porky Yorkie or one of mine
if it is a long tube one then porky yorkie came up with them to be either bulkfill or 4 caplet(the robber copied his idea when he was a member of UKCAF and why he isn't well regarded by most on there)
if the cap looks to be an original steel one with just the foster fitting added them it will likely be a dual bulk or capsule one
if it has a brass inner with a std steel retainer it's probably a gmac half conversion
if it has a brass retainer and inner a full gmac one
if it has a brass retainer with aluminium inner(some i anodisedblack) and two orings it could be one i made
I agree it sounds like a bulk fill end cap.
You can fill it compressed air to 1000psi. You will only get 5 shots.
Repariere nicht, was nicht kaputtist.
Could someone please explain the benefits of conversion from Co2 to air?
Cheers, Lawrie
Last edited by Lawrie Amatruda; 20-03-2023 at 07:22 PM.
i don't think there is on a 78 unless you're using a remote tether from a large regulated cylinder from a static position
the 78 imo is better on co2 ,bulkfilling only brings the cost down
the 79 now is better with a 13ci paitball tank fitted -very large shot count and fps spread is very low,nothing really req to alter on a std gun(i personlly swap the gas block bolts to UK sourced ones
Oh yes, more shots per fill.
Repariere nicht, was nicht kaputtist.