I wanted to post this information to help FX Maverick purchasers deal with some of the issues that have happened to me. My Maverick is in .30 cal and has the Superior Heavy Liner installed. 1. The cocking lever attaches to the stainless steel cocking rod via a hand and 2 screws. These screws shot loose at about the 400 round mark. I went to cock the rifle and the hand simply slid on the stainless steel rod. That day's shooting was over. I figured out where the hand was supposed to attach to the stainless rod and retightened the 2 screws. They shot loose a second time in just a week so I had to blue loctite them. Now they are holding. 2. I was shooting at 200 yds and kept having to add elevation to the rifle to stay on target. My Strelok Program said I needed 42 MOA to reach 200 yds but I was at 90 MOA!! So I checked the tracking on the scope and it appeared to be moving well. I then broke out the chronograph and found that the rifle was only putting out 625 FPS with the NSA 54.5 gr slug. The rifle used to produce 880 FPS. I was already on the max power setting of #7. So I turned the power wheel to the "Adjust" setting and turned the 1.5mm screw counterclockwise and sure enough the velocity returned to 880 FPS. 10 shots later the rifle dropped back to 850 FPS. What is happening? I quit and went home and called Utah Air. Josh at Utah was very helpful and it turns out that the screw underneath the power wheel had shot loose and was free to spin. And as it threads its self inward you lose hammer spring tenson and velocity. I had to remove the power wheel and again figure out where that adjuster screw has to sit for max power. And again I had to blue loctite it in place. It is now holding its position. 3. The main bolt that the power wheel rotates on also shot loose. It was backing out of its hole. This too will reduce hammer spring tension and you will lose velocity. If it gets too loose you will lose the detent ball that sits trapped under the power wheel. Again I had to blue loctite this bolt. If you decide to proactively loctite this bolt, be very careful that you do not lose the tiny detent ball that sits trapped under the power wheel. 4. The FX Maverick magazines have a rubber grommet on the clear plastic magazine face to provide tension when inserted into the action's magazine slot. Unfortunately that rubber grommet has to be pushed past a very sharp corner machined on the action/magazine slot. I have 4 magazines. That sharp edge on the action/magazine slot has cut chips out of the rubber grommet on two of the magazines and on a third magazine it ripped the grommet clear off the face of magazine. I have no idea where that grommet is. The grommetless magazine is now loose and has feeding issues. The solution FX is simple, just put a slight radius on the edge of the action's magazine slot so that it compresses the grommet on insertion instead of cutting or ripping the grommet clear out of its socket!! I hate to do this filing on a brand new rifle. Softening that corner/edge will cut through the black anodizing and leave the aluminum silver showing through. Pretty crappy to do to a new rifle. FX, if you are listening- please put a radius on that edge. 6. I bought this rifle due to the national shortage on 22 long rifle ammo. I wanted to see if the rifle could be a workaround for the 22 rimfire shortage. The ads for the rifle claimed 116 ft/lbs with the "slug power kit". and that energy level is pretty close to Eley Tennex or similar target ammo. So I buy the rifle and then find out that FX released the rifle before that slug power kit was actually developed. So I feel as if FX pulled a bait and switch saleman tactic on me. Everytime I have asked about when the power kit will be released I receive no date, not even a rough estimate as to when it will be available. So the whole FX experience has been pretty disappointing. Everything that has shot loose on this rifle has happened within the first 1,000 rounds. Whoever is responsible at FX for durability testing needs to go back to school! I know that's harsh but these issues are going to present a huge warranty load for Utah Airguns and anyone else who sells these rifles. They are also very frustrating for the gun owner who will have to ship the rifle back and forth to the dealer for service. Shipping is expensive too. These rifles need to be assembled with the goal of staying together for 10,000 rounds or more. My rifle started shooting loose at the 400 round mark and that is simply unacceptable. And when you advertise performance levels, the parts to reach those performance levels should be available if you are going to use those specifications to sway sales.
The magazine issue certainly seems like something that needs to be addressed. On my FX magazines the rubber piece is an o-ring not a grommet, unless they changed the design a -004 o-ring should fit, weird that it's standard and not metric on a European air gun. That's just from my own measuring and I haven't tested any replacements but the o ring just pops in and out the of the magazine so it can't hurt to try, if -004 doesn't fit next closest is probably 2x1mm. I don't know if they have an order minimum but if these don't hold up then FX needs to do something to fix your gun in my opinion, only thing more durable than these is gluing a slug of delrin into the o-ring hole. https://www.theoringstore.com/store/index.php?main_page=product_info&cPath=367_459_458&products_id=47616
Never had a gun that literally falls apart just from shooting it. After 2 months of trying, I sent the gun in to be professionally repaired. The gun has to be pretty much Locktited together to keep from disassembling itself. For anyone doing the work themselves, I would also recommend using Purple Locktite on the screw that connects the probe to the reloading rod, and the screw that blocks the trigger from being depressed when on Safe. Mine worked it's way shorter, and I realized the gun could be fired with the safety in the ON position.