I have taken so far 550 shots, mix of suitable pellets and slugs. I am still into testing, measuring speeds at the various power settings for my favourite pellets/slugs. I have always payed attention to have the proper pressure for the pellet, usually I shoot from 280 bar down to 150-170 bar, depending on the weight of the pellet/slug. Never did speed shooting. Trigger also adjusted, so I have a defined two stage, not too light. I was shooting last week JSB/Exact Jumbo Heavy/Pellet 18.13 grain, JSB/Exact Jumbo/Pellet 15.89 grain @ 1.25 power setting. 19 shoots each to measure the pressure consumption. I refilled again to 280 bar between strings. As I am doing statistics with all my shooting from the beginning, I overved that with the same power setting I am getting in the mean time more speed. At first tought I had not set the power screw correctly, so I repeated the shots with the same setting. For example, for the JSB 18.13 grain with 1.25 power I had last year at the beginning 217 m/s, now 550 shots later I am getting 228 m/s. Any body out there similar observations? Would be interesting to read from you.
Now to my problem. After refilling to 280 bar I was shooting JSB/Exact Jumbo Monster Redesign/Pellet 25.39 grain @ 1.5 power, which I had done before several times. After two shots, the gun start slowly to loose all pressure. This is what I observed and what I did:
Safety was not engaging, magazine could be turned manually in the correct direction, even when locked. The magazine release arm moved back and forth without resistance. I set the power screw back to zero (fully clockwise in) and removed the magazine plastic side cover to empty the pellets. I had 19 pellets loaded and recovered 17, so barrel was clear. Then I put back on the side cover. After opening the back plate I could remove the striker buffer spring. The blue striker buffer could be pushed in until an audible click. Then the safety was working again. Striker buffer I have taken out gently with an allen key, then I could push the spring through the buffer about half way. Then it was possible to re-assemble. During refilling, at approx. 100 bar the magazine indexing "kicked in" (sounded like rattling). Then I filled to 180 bar and dry fired 3x. Pressure still at 180 bar. I know that the striker buffer spring and the striker buffer are in the spare parts set, but the existing parts looked good so I used them again. The only thing I did not do was to put grease back on to the spring, because I had the impression that there was enough inside.
So my question is, why did this happen. I always shoot according to the manual and the good advices from this forum and other experts, like Luchtbuks. Will this happen with GK1 V3 on a regular basis? Is there anything I could do to improve the situation and avoid that this happens again? In the mean time I am back into shooting and the gun performs as it should be. Just wanted to share my experience.
I head posted this already under the PCP Airgun section by mistake. So I am reposting this here again.
