Tuning FX Impact MK2 Compact cocking lever question

[CoyoteGod]

After tuning by Ken Hicks I got the rifle back and I notice that the cocking lever pops open to the spring after each shot. Is there a screw or something else I need to tighten down to stop that from happening? Can this issue cause air loss during shots or erratic spreads?

 

[madeintheuk]

I would be contacting ken first. He has a stand up reputation in the airgun world both as a seller and a tuner. He will take care of you!

 

[paulemar]

Sounds like you lost the rubber ball that applies tension to the closed bolt. The ball or hole should be on the rear inner face of the bolt closure just below where it says MKII. I lost mine recently & Ken didn't have any available & suggested I contact FX. I don't like anything that relies on those rubber balls. I think FX has phased those out on new guns. I bought some online that weren't the correct size but close & I shaved it down with a razor blade to fit the hole. None of the other online o-ring & ball sources I looked at had the correct size. I have 4 FX guns & tried to order a few needed parts & quite a few spare parts using their online order form & got no response.

 

[Bigragu]

Since the rubber ball is in place, then ponder this: If the gun got fired when the bolt was open it’ll bend that pin that connects to the cocking linkage. Not only will this possibly not allow the trigger sear to catch, it may affect bolt lock down, and since that cocking block is a part of the pellet probe by way of a 3mm connecting rod, if it’s not landing where it’s suppose to be, it will affect where your probe finishes out at when the bolt is closed forward, and that will for sure have an alignment issue with the air transfer ports between the pellet probe and the brass thimble, which will cause the velocity loss your now suddenly experiencing.

if you didn’t accidentally fire it with the bolt latch all the way back, I would email Hicks to see if he did.

lastly, check to make sure that 5mm grub screw on the right side of the gun that locks your barrel in place is cinched down. No need to gorilla torque on it, just an 1/8” turn past hand tight.

another thought- your hammer stop, or the C1, could’ve back out past the required spec. I am unsure if this would affect your cocking latch not staying closed, though.

 

[CoyoteGod]

Since the rubber ball is in place, then ponder this: If the gun got fired when the bolt was open it’ll bend that pin that connects to the cocking linkage. Not only will this possibly not allow the trigger sear to catch, it may affect bolt lock down, and since that cocking block is a part of the pellet probe by way of a 3mm connecting rod, if it’s not landing where it’s suppose to be, it will affect where your probe finishes out at when the bolt is closed forward, and that will for sure have an alignment issue with the air transfer ports between the pellet probe and the brass thimble, which will cause the velocity loss your now suddenly experiencing.

if you didn’t accidentally fire it with the bolt latch all the way back, I would email Hicks to see if he did.

lastly, check to make sure that 5mm grub screw on the right side of the gun that locks your barrel in place is cinched down. No need to gorilla torque on it, just an 1/8” turn past hand tight.

another thought- your hammer stop, or the C1, could’ve back out past the required spec. I am unsure if this would affect your cocking latch not staying closed, though.

Ok, I will start trouble shooting the issue. Sure one of these options is the issue. I know I DID NOT fire the gun with the cocking lever back and breech open. I am in contact with Ken already by text.