Tuning M3 Sniper rattle

[DesAstor]

I am not sure if I just never noticed it before, or if something has changed inside the gun. But I have just noticed yesterday that moving the gun up and down (from a horizontal plane), there seems to be something sliding back and forth either in the breach block (aluminum piece w/the M3 logo on it) or below it (if it were a firearm I'd call that the receiver). This only happens after I have taken a shot (I assume there is no pressure inside the mechanics at that time) and when the gun cocking lever is in the forward position (w/out a pellet or pressure). When I move the cocking lever backward until the point of resistance, or cock the gun to shoot, the noise disappears. It seems to be shooting OK (but I do not have a chrono yet and a better scope and pellets are on the way). It is clearly not the mag as I had taken that out bc the pellets give a rattle themselves. If I try to visualize the noise it really seems that something is sliding either on or inside of something back and forth whenever I lift or lower the gun off the horizontal plane. Pointing the gun downward results in a louder "klink" while pointing it up is much quieter as like it hits a hard surface vs hitting a spring or something elastic, moving down and up, respectively. I am a bit concerned that something has broken or come loose? I have not had a chance to look at schematics but was hoping someone w/much more experience to give some feedback. Should I be shooting the gun? Does it need repair?

Any of you mavens, I'd love to hear from you.

D

 

[DesAstor]

So, I had some time and looked at the schematics. The breach block, a.k.a trigger block has a steel ball (D63 and a spring D64, in the schematic F10370-Impact-M3.pdf (fxairguns.com). Is this what I am hearing?

 

[M0ist0ne]

Sounds like it's the hammer. It's floating. The noise should stop when the rifle is cocked if that is the case.

 

[biohazardman]

It is most likely the hammer and or hammer weight sliding back and forth if it stops when you cock the gun. It is a normal function of the gun.

 

[DesAstor]

Uh, that is a relief. 

An hour ago, I was fairly certain that I had not heard that noise before bc it is pretty apparent. But, w/all new things, especially unfamiliar types of machinery, I may have blocked that out bc I was focusing on all of the other new things on the gun and may have not realized the noise. But maybe some of the oil has worn off and hammer is less sticky and thus moves around easier? It is an annoying sound though.

But, you guys telling me the gun is OK, I take that to the bank. And that is the most important thing

Thank you very much

D

 

[Airgunmann]

It's the hammer

 

[dannya1a]

not the hammer its the spring guide. unless the m3 are different from the mk2

 

[biohazardman]

The spring guide does not exist on an M3 it is now a hammer weight and captured on the end of the spring. It can still move inside of the hammer and spring though.

https://fxairguns.com/wp-content/uploads/2021/04/F10370-Impact-M3-1.pdf