This AK 455mm tightbore is really good for its price! I put it in my Echo 1 M4A1 and used a JBU silencer to hide the extended inner barrel because it sticks out about 3 inches without the silencer, however, the silencer makes it look even more badass! Seriously, Terminator 2 fans, it looks like Sarah Connor's M4. I was actually planning on purchasing a Prometheus tightbore, but decided to save some money and by the next best thing: Systema.
*Easy to install
*Fits perfectly into my Echo 1 M4A1
*Adds an approximate FPS boost of 10 - 15
*A high accuracy increase
*Really good price if you can't afford a Prometheus
*When cleaning out my barrel, my cleaning rod is not long enough to reach the lower end of the barrel close to the hop-up. So, what I did was grab my MP7 cleaning rod and pulled out the back end and taped the two cleaning rods together to fix the problem.
*Since I extended the barrel, there is some time to get used to the extra length, but all it takes is some time.