Ranchero50
Well-known member
No real gun porn since I put it together without taking pics but...
I have a Gamo 1200 Big Cat, used for urban 'pest removal' and plinking stress relief. It's been stock and working fine for two years but since it was raining I took it apart today after searching things to do to it. I didn't like the excessive twang and rattling from the spring so I downloaded a tune up how to from here: https://www.charliedatuna.com/index.html
Basicly took the receiver apart, used my drill press as a spring compressor to unload the compression spring, sanded and honed all the rough finishes, polished the spring too. Made a brass spring cap for the piston end and a nylon cap for the stationary end, both fitting the spring ID better than the cheap stamped OEM parts.
Reassembled and it's a different gun. The twang is gone, the recoil is about the same Accuracy is about the same too, groups around 1" @20yds for me with the 4x scope. The biggest difference is now it's firing crossman hollow points supersonic half the time. It'll poke a hole in the steel barrel when it does, or two hits when it doesn't. I was tinkering around and put a dab of hydraulic oil in the cup in the back of the pellet and it'll really put a hole in the barrel like that, cracks louder than a .22 and kicks a bit more than normal.
I'm out of PBA ammo and the other Gamo ammo I have doesn't shoot as well as the cheap Crossman stuff but this is fun for a rainy day. The shot pellets I've found are just flat discs too.
Jamie
I have a Gamo 1200 Big Cat, used for urban 'pest removal' and plinking stress relief. It's been stock and working fine for two years but since it was raining I took it apart today after searching things to do to it. I didn't like the excessive twang and rattling from the spring so I downloaded a tune up how to from here: https://www.charliedatuna.com/index.html
Basicly took the receiver apart, used my drill press as a spring compressor to unload the compression spring, sanded and honed all the rough finishes, polished the spring too. Made a brass spring cap for the piston end and a nylon cap for the stationary end, both fitting the spring ID better than the cheap stamped OEM parts.
Reassembled and it's a different gun. The twang is gone, the recoil is about the same Accuracy is about the same too, groups around 1" @20yds for me with the 4x scope. The biggest difference is now it's firing crossman hollow points supersonic half the time. It'll poke a hole in the steel barrel when it does, or two hits when it doesn't. I was tinkering around and put a dab of hydraulic oil in the cup in the back of the pellet and it'll really put a hole in the barrel like that, cracks louder than a .22 and kicks a bit more than normal.
I'm out of PBA ammo and the other Gamo ammo I have doesn't shoot as well as the cheap Crossman stuff but this is fun for a rainy day. The shot pellets I've found are just flat discs too.
Jamie