Obviously this would affect many of us drastically so we need to get the facts straight.
Quote from: rsterne on March 08, 2019, 12:54:59 PMI just found this warning from TKO22.... I have no first hand knowledge of this, but PLEASE check this out if you are considering using HPA on a gun equipped with a 2260MB tube.... Even bulk filling with CO2 would be questionable, as the safety margin if the gun is left inside a hot car would be less than 3:1.... CO2 can reach 1900 psi at 120*F....QuoteTKO22 SAYS:The Crosman 2260 air tube has recently been changed by Crosman.The new tubes are marked: "2260MB". These ARE NOT THE same as the old 2260 tubes. They are 0.049 wall and machine very differently than the old "2260" tubes (0.065 wall). The 2260MB tubes also have a hard step at the front threaded end that will make it very difficult to get it to seal with a Discovery fill adapter. The 2260 tubes are chamfered for a smooth squeeze on the adapter o-rings.I have hydro'd a couple of the newer 2260MB tubes, and they failed at ~4100-4600 psi. In each case, the fill adapter blew out the front.I have assembled about 50 PCP pistols and carbines over the course of 5-6 years, using the 2260 tubes and no failures reported. I wouldn't use a 2260MB tube except for a Co2 cartridge gun.If this is in fact true, this thread should be made a sticky, IMO.... Stay Safe !!!!BobI have three tubes in front of me:A 2260MB, a Discovery and a Maximus tube.The 2260MB tube wall is .049. OD: .863The Discovery tube wall is .063. OD: .875The Maximus tube wall is .065. OD: 874Average of 3 measurements each.Probably the same material as they machine identically, but not the same dimensions.It would be a good idea to measure and verify dimensions with any 2260MB tubes you are considering for a PCP build.
I just found this warning from TKO22.... I have no first hand knowledge of this, but PLEASE check this out if you are considering using HPA on a gun equipped with a 2260MB tube.... Even bulk filling with CO2 would be questionable, as the safety margin if the gun is left inside a hot car would be less than 3:1.... CO2 can reach 1900 psi at 120*F....QuoteTKO22 SAYS:The Crosman 2260 air tube has recently been changed by Crosman.The new tubes are marked: "2260MB". These ARE NOT THE same as the old 2260 tubes. They are 0.049 wall and machine very differently than the old "2260" tubes (0.065 wall). The 2260MB tubes also have a hard step at the front threaded end that will make it very difficult to get it to seal with a Discovery fill adapter. The 2260 tubes are chamfered for a smooth squeeze on the adapter o-rings.I have hydro'd a couple of the newer 2260MB tubes, and they failed at ~4100-4600 psi. In each case, the fill adapter blew out the front.I have assembled about 50 PCP pistols and carbines over the course of 5-6 years, using the 2260 tubes and no failures reported. I wouldn't use a 2260MB tube except for a Co2 cartridge gun.If this is in fact true, this thread should be made a sticky, IMO.... Stay Safe !!!!Bob
TKO22 SAYS:The Crosman 2260 air tube has recently been changed by Crosman.The new tubes are marked: "2260MB". These ARE NOT THE same as the old 2260 tubes. They are 0.049 wall and machine very differently than the old "2260" tubes (0.065 wall). The 2260MB tubes also have a hard step at the front threaded end that will make it very difficult to get it to seal with a Discovery fill adapter. The 2260 tubes are chamfered for a smooth squeeze on the adapter o-rings.I have hydro'd a couple of the newer 2260MB tubes, and they failed at ~4100-4600 psi. In each case, the fill adapter blew out the front.I have assembled about 50 PCP pistols and carbines over the course of 5-6 years, using the 2260 tubes and no failures reported. I wouldn't use a 2260MB tube except for a Co2 cartridge gun.
The only information I have is what I posted in the OP of this thread....Bob
That is a good point... I ordered part number 2260-004 as well.So Dan.... what was the serial number on your tube?
Found it by searching here on the GTA.... https://www.gatewaytoairguns.org/GTA/index.php?topic=152894. …. Reply #11....Bob
Edited to add: If I recall correctly, the 2260 tubes were roll stamped on the right side, the 2260MB tubes are stamped on the left side.
219500204 which looks to be laser etched. Too bad they can't make the warning laser etched.
That is very close to mine I just received...219500215. So looks like 11 tubes off the line apart.Makes me think it may not be "old Stock"