Nickpan
26-07-2006, 07:29 PM
This rifle is a sort of stepping stone, between a loadsof fun co2 pistol and the new wave of gas rifles that take the big old Airsource Crosman 88gram style fatty co2 cylinders. The '78 takes 2 co2 12gramm bulbs, which go into the 'pcp looking' cylinder, under the barrel. The first bulb goes in pointy end first, ie, the pierceable bit first, and the second one butts up to it, with the small flat cap looking out. You then screw on the lid till it stops, count to 5, then undo it a tad. This unscrewing releases the gas, and you'll hear a quick hiss as pressure in the tube hits max (I lied about counting to 5).
This will give about 40 - 50 shots (I'm guessing) at the rifles top power, which is about 10ft lbs. I don't think the seals are soft, so there is no disadvantage to leaving gas cylinders in for extended periods of time.
That's the theory section finished.
I don't mind admitting that I didn't read the manual, so it was two bulbs in, screw lid on, fire. All the gas from one bulb hissed straight out in a couple of seconds, so then I learnt about the half a turn unscrewing. Next two co2s worked a treat.
No matter how I adjusted the rear sight, I couldn't get the pellets low enough to hit the target. Then I noticed a significant scuff mark, atop o' the barrel. I've a strong feeling that this barrel has had a whack, and is now bananana-ing upwards (I know how to spell banananana, I just don't know when to stop). I rang the supplier, who suggested I gently tighten the barrel ring. I gently tightened it, and then gently tightened it a bit more. The nut and bolt snapped, revealing that uniquely, it has a very thin bit in the middle, that really can only survive a gentle tightening. I bunged a scope on, and have solved the problem, as far as I'm concerned. In a similar blinkered fashion, a rattley car engine noise can always be cured by simply turning the radio up, or screaming constantly as you drive. There's two top tips for you.
The 3rd set of bulbs also seemed to work fine, and I fired a couple of dozen shots, the went to make a coffee. When I returned, all pressure had gone, all I got was a hammer twang. Where gas? Another couple of shots, but exactly the same, pellet sitting in barrel.
s h i t c a k e s .
I left it for a week, then grabbed a couple of bulbs of gas to start again, but I couldn't unscrew the lid. Strain, heave, something moved, the gun fired itself and the pellet snicked past my chinster pasty. Now, can we all learn a safety lesson from that please. Fiddling with the lid/cap, must have released another gas cylinders charge. Luckily the pressure was so low, that the pellet bounced off the inside of the conservatory roof, as if it had been thrown underarm, by a weak four year old. That had recently sprained its throwing arm.
I removed the co2 x 2, and put vaseline on the tips of a new pair. I daresay that is a foolish thing to do. Tighten tighten tighten (it takes some tightening), untighten a half turn. I fired a shot, and was greeted by a gentle hissing, heard from both ends of the barrel.
Is this the clear looking seal that is mullered, the one between charge cylinder and barrel?
Shall I put it all in the bin, sir?
This will give about 40 - 50 shots (I'm guessing) at the rifles top power, which is about 10ft lbs. I don't think the seals are soft, so there is no disadvantage to leaving gas cylinders in for extended periods of time.
That's the theory section finished.
I don't mind admitting that I didn't read the manual, so it was two bulbs in, screw lid on, fire. All the gas from one bulb hissed straight out in a couple of seconds, so then I learnt about the half a turn unscrewing. Next two co2s worked a treat.
No matter how I adjusted the rear sight, I couldn't get the pellets low enough to hit the target. Then I noticed a significant scuff mark, atop o' the barrel. I've a strong feeling that this barrel has had a whack, and is now bananana-ing upwards (I know how to spell banananana, I just don't know when to stop). I rang the supplier, who suggested I gently tighten the barrel ring. I gently tightened it, and then gently tightened it a bit more. The nut and bolt snapped, revealing that uniquely, it has a very thin bit in the middle, that really can only survive a gentle tightening. I bunged a scope on, and have solved the problem, as far as I'm concerned. In a similar blinkered fashion, a rattley car engine noise can always be cured by simply turning the radio up, or screaming constantly as you drive. There's two top tips for you.
The 3rd set of bulbs also seemed to work fine, and I fired a couple of dozen shots, the went to make a coffee. When I returned, all pressure had gone, all I got was a hammer twang. Where gas? Another couple of shots, but exactly the same, pellet sitting in barrel.
s h i t c a k e s .
I left it for a week, then grabbed a couple of bulbs of gas to start again, but I couldn't unscrew the lid. Strain, heave, something moved, the gun fired itself and the pellet snicked past my chinster pasty. Now, can we all learn a safety lesson from that please. Fiddling with the lid/cap, must have released another gas cylinders charge. Luckily the pressure was so low, that the pellet bounced off the inside of the conservatory roof, as if it had been thrown underarm, by a weak four year old. That had recently sprained its throwing arm.
I removed the co2 x 2, and put vaseline on the tips of a new pair. I daresay that is a foolish thing to do. Tighten tighten tighten (it takes some tightening), untighten a half turn. I fired a shot, and was greeted by a gentle hissing, heard from both ends of the barrel.
Is this the clear looking seal that is mullered, the one between charge cylinder and barrel?
Shall I put it all in the bin, sir?