Umarex Fusion .177 Caliber Pellet Gun Air Rifle, Fusion 1

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1. Jon A. Verified Buyer – 14 November 2024

   I purchased this gun for my 13 year old son for backyard target practice. Once the scope is sited, be prepared for very good accuracy. You should also be prepared to throw this gun in the garbage relatively quickly. The C02 cap / piercing mechanism is faulty. Google this gun, read other reviews and you’ll soon realize roughly half of the reviews specifically bring this issue up regarding the C02 issues being messed up on a number of fronts. Unfortunately, I recommended this gun to two of my friends for their sons and soon after tossed their guns in the garbage. BTW, these two friends were avid hunters and know gun safety. One of them nearly lost an eye dealing with the faulty mechanism. Umarex customer service knows of these issues yet doesn’t have an engineered replacement part. I kindly asked for a comparable replacement gun that doesn’t have these issues and I was was responded with crickets. I also went to their website to put this review up and they ONLY put positive reviews on their site. Funny how that works. Buyer beware. I only wish I could put zero stars as a serious safety issue like this should not be even sold.
   

2. StayPuff Verified Buyer – 10 March 2025

   Very quiet to start, but not enough for me. I “replaced” or cut off the OEM LDC & made my own (huge performance improvement). Cleaned, polished & adjusted the trigger, adjusted sear to my liking of trigger break. I turned the power adjuster down a little (now shooting around 675fps), and recrowned the barrel. The original crown was nice. It didn’t have any burrs or rough spots. But it could be improved. I never used the junk scope that came with the Fusion. First I used a spare cheapo center point 3-9×32 I had laying around. After seeing what a little tack driver it really is, I thought of throwing a bug buster on it (have more than a few UTG’s). I robbed a bug buster from a 1377 to test, much better! But not enough magnification for what this little rifle can do. I mounted a 4-16x50mm. Yeah overkill, but its front AO so I can adjust for any distance….and being this rifle is this accurate, the amount of magnification lets me decide exactly where the pellet is going to surgically end up! Getting a much better scope for this air rifle really improves repeatable performance! In short its accurate enough to really benefit from a nice optic upgrade. After some care and adjusting and some light mods, its truly Marauder quiet and super accurate. 10/8/14 update…. Ok I have ran a ton of pellets through it. Rifle is great! Its shooting “hole in hole” at 25yds no problem. I have tired out about 13 different pellets to find the “magic pellet” for my fusion’s barrel. Out of 5 different Crosman pellets, 4 RWS pellets, and 4 different JSB’s…… the JSB exact heavy 10.3’s seem to be by far the most repeatable and accurate pellet. Also the heavier pellet is much quieter of course than a lighter grain pellet. I have been shooting about 50-100 pellets a day. Very fun rifle. Taking out snails 45′ away. So far 23 snails using 23 pellets 🙂 Also these are perfect orings for the fusion! They don’t swell up like the OEM did. Silicone O-Ring, 70A Durometer, Red