I have the biathlon basic 7-2, very very accurate and fun to rack the bolt, super fast. I used to have the actual biathlon 7-4 which was laser accurate. THe stock design makes them very comfy to shoot off hand. I read somewhere that it is quite a job to change barrels as they are heat fitted and then some adhesive is applied also so removal is very very difficult. But I think the stock barrels are just fine. Plastic mags are crude and cheap looking and feeling, but they work just fine, don't jam and are easy to load and insert into mag well. The 7-2s typically come with 5 mags already, 7-4 come with 8 mags. I always have a big smile shooting my 7-2. It was a bit pricey at $1000 but I never regretted getting one. I would get the 7-4 again if I had the chance. Interammo has 7-2s in stock. You might even get a deal if you negotiate some.