BSA Lightning GRT in .22

[schony]

I have bought one of these Marmite guns, personally I love mine. Smooth to cock, trigger better than I need, far more accurate than I am, firing cycles with a thump and love the smooth cocking cycle. I love the looks and the feel or the gun, however. The power is down to 9.7 ft lbs and I would like to bring it up to legal maximum. I have noticed on BSA web site that these are supplied in different powers dependent on local laws. Do you think some rifles arrived here with the wrong rating of ram in i.e. the 13.5 joule version, it would explain the numbers that have complained about it being down on power? Anyway I have contacted Knibbs and when the 16 joules model comes in I will order one and see how that goes, another alternative I considered but dont know if it is practical is, can a preload be applied to the ram to increase power. It may be a stupid totally unworkable solution, I really dont know anything about gas rams. I know it can be done with normal spring rifles. Comments please on a postcard to ??????????
Thanks for any opinions on this at all.

[bighit]

you cant preload the ram any more than it is i don't think. if you do you may stop the ram from contracting enough to then let the rifle cock. like coil bound in a spring . the spring is compressed solid and the bit on the piston does not reach the sears so it wont cock .



more pressure in the ram will give more power but as its a sealed ram there is no way to pump it up.



it was asked here too
https://www.gatewaytoairguns.org/GTA...?topic=24250.0


hatsan do an adjustable ram but you have to remove the ram and pump it and then rebuild and test, then if its not right you have to strip and pump it or decrease the pressure then rebuild and test it

[schony]

you cant preload the ram any more than it is i don't think. if you do you may stop the ram from contracting enough to then let the rifle cock. like coil bound in a spring . the spring is compressed solid and the bit on the piston does not reach the sears so it wont cock .



more pressure in the ram will give more power but as its a sealed ram there is no way to pump it up.



it was asked here too
https://www.gatewaytoairguns.org/GTA...?topic=24250.0


hatsan do an adjustable ram but you have to remove the ram and pump it and then rebuild and test, then if its not right you have to strip and pump it or decrease the pressure then rebuild and test it

Thankyou, I checked the link you provided and the answer seems a flat no and that is that. What do you think of my assertion that some rifles whose owners have complained of being low power having the wrong gas ram fitted at the factory, perhaps because the need to fill orders meant they substituted 13.5 joules rams when perhaps 16 joules rams were out of stock or unavailable at the time of assembly?
Alan

[bighit]

Thankyou, I checked the link you provided and the answer seems a flat no and that is that. What do you think of my assertion that some rifles whose owners have complained of being low power having the wrong gas ram fitted at the factory, perhaps because the need to fill orders meant they substituted 13.5 joules rams when perhaps 16 joules rams were out of stock or unavailable at the time of assembly?
Alan

i could not answer that as i don't know . its possible there was a few slipped by . might be worth emailing BSA to ask if there was any recall due to it then you would know .

just read your post regarding the sling stud . thats a bummer .

[schony]

i could not answer that as i don't know . its possible there was a few slipped by . might be worth emailing BSA to ask if there was any recall due to it then you would know .

just read your post regarding the sling stud . thats a bummer .

Sling stud now sorted. I had to super heat it and hammered a star bit into the damaged allen grub screw. It was still blinking hard work but I have now managed to remove it and fitted the BSA sling swivel stud in place using blue locktite so should be ok. Will soon find out

[robs5230]

What pellets are you using ?
Pellet choice will have a massive impact on power.
I'd say unlikely it has the wrong ram.

Try some lightweight pellets and also consider the breech O ring may be worn.
Get a small bit of tissue paper and put it on top of where the breech mates to the cylinder when the rifle is cocked and loaded. If the breech o ring isn't sealing, the tissue will blow off.