Massive fps fluxuation on Ranchero .22

Alright, so I buddy of mine and I share our airguns, I ususlly test them, sight them in and get them running. He got a tons of air rifles for free essentially, some of them work just fine, and some of them needed some work. I've worked out the kinks to most. The ranchero he got has a massive fps fluxuation, and I mean where one shot will be 540fps, the next will be 380fps, and then 450fps, and then 250fps, and back and forth. Initially, I figured it was the hammer. When I tore the damn things I apart there were metal shavings all inside the block. Bad enough to wesr it landed all on my lap when I started taking it apart. The edge of the hammer was getting beat up. I assumed from improper cocking on the handle. I ordered one through FX and miraculously they found one, only took about 2 months. So I cleaned the guns replaced the hammer put it back together and cycles fine. But the issue still persists, now the gun has a small leak, I'm assuming it's coming from within the cylinder. My suspicion is that the reg may be leaking, but could a leaky reg cause the speed to fluctuate by hundreds of FPS?
 
I own one in .177, but had no idea if it was or was not regulated. I was under the impression it was not? Mine was service by FX this year, so I'm pretty clueless as to it's inner workings. Most all of my airguns I have serviced myself, but being that I bought it already serviced, and it works as intended, I saw no need to fiddle.

That said, if there were metal shavings, I think it's due for a complete teardown and inspection. Could be the valve is damaged. Might be fixable without new parts, but may not.
 
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I own one in .177, but had no idea if it was or was not regulated. I was under the impression it was not? Mine was service by FX this year, so I'm pretty clueless as to it's inner workings. Most all of my airguns I have serviced myself, but being that I bought it already serviced, and it works as intended, I saw no need to fiddle.

That said, if there were metal shavings, I think it's due for a complete teardown and inspection. Could be the valve is damaged. Might be fixable without new parts, but may not.
I inspected the valve, but I didn't notice anything out of place. But I'm no expert, did you buy yours from fx-usa?
 
I inspected the valve, but I didn't notice anything out of place. But I'm no expert, did you buy yours from fx-usa?
Hm. I'd be worried about debris either damaging the stem or the valve body where the stem rides. May be fine, though. Other concern would be the area the hammer rides in. It may need to be sanded and polished if it is galled from debris.

Bought from AirNGasman

332681419_778303993139164_3397354390380902971_n.jpg
 
Hm. I'd be worried about debris either damaging the stem or the valve body where the stem rides. May be fine, though. Other concern would be the area the hammer rides in. It may need to be sanded and polished if it is galled from debris.

Bought from AirNGasman

View attachment 362594
Beautiful! I checked the body internally and had not seen any damage to the body itself, but I will take a second look.
 
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