I have a problem with my TR4-18 had it out yesterday and went to get it fps check before the game and it was 89fps only used the rif 2 times before this with no problems adjusted the hop a bit thinking that could be the problem because it seemed to work. But later on when I changed mags found the first 5 to 10 rounds in each mag the fps drops you can even see the difference when firing the bbs drop about 20-30ft away then fire spot on after that. I have emailed land warrior because purchased this rif last September so should still be under warranty. I am using 0.25 blaster bbs and G&G 120 mid caps any help would be great