Loses too much speed

Way too much speed lost, makes the ball very inaccurate, switched back to stock barrel after two rounds. Not worth it. Didn't try it at very close range, but that isn't the reason to use the barrel. Product is solid, installed easy on my Sierra One, just didn't add any value. Even if i upped my velocity all the way.

great upgrade

I bought the flatline and use it on my Tippmann Alpha Black and it increases the range very well. It is accurate at closer range as you'll be getting a lot of stray shots when you try shooting further. It has an upper rail but not a lower one. It has a sling loop on the bottom so you can still use a sling. Seeing as I put it on the alpha black you can also put it on the seirra one for sure (I tried) but I'm not sure about the bravo one. The barrel really cuts into the velocity. I spent 30 mins chronographing my marker and the field FPS Max was 240 and I could only get the marker up to 200. So if you want a upgrade that increases range it is okay but also look into the Apex2 because it is similar

Great Upgrade

shoots nice and straight and its accuraccy is way better than the stock barrel