I was wondering how the reviews are on the R-25 and if it has any of the classic jamming problems that the AR-15 guns have. I'm looking to buy an AR style weapon but don't want to deal with jamming or the small 223 rounds. The R-25 is available in 7mm, 308 win, and the 243 win round that I'm looking at buying but my main concern is reliability. I was also wondering if there is any other AR style weapon that might be better and be submerged under water and sand then removed and immediately fired. I know the Colt M4 pretty much explodes when putting it in water then firing directly after. I need a very very durable and reliable AR style weapon.