very possibly an expansion chamber but I havn't tried yet so don't quote me on that.
barrel upgrade wouldn't hurt
Sliding hopper elbow
Not too pricey
Easy tear down
Uses a lot of C02
Speed and accuracy
Upgrades (see review)
First off I'll tell you that this marker accepts A-5 and 98 parts. (A-5 barrels 98 stocks and internals which can get confusing and the internals from a 98 don't even fit right, I tried) Whats up with that? I know BT is Ben Tippmann but, it is a different company and marker. There arn't too many BT-4 specific upgrades yet.
I bought this marker between 6 months and a year ago after playing woods ball with some friends.
The first time I played I used a rental tippmann pro-carbine and had a great time. The pro shot straight and fast and only used a 20 oz. tank to about 1200 balls, played all day on one tank. Needless to say I was hooked and decided to buy a marker. Not wanting to be like every body else (tippmann 98's - A-5's) I bought the BT-4.
First time I played with this marker I just couldn't seem to hit squat, and the speed felt slow even after many adjustments. By the end of the day I had gone though about 3 20 oz. tanks of C02 to 2000 balls. Wasn't happy at all.
Feeling maybe it was just high expectations, I bought a J&J 14" ceramic barrel and a 32 degree remote line hopping to improve the accuracy and C02 usage for the next month of play. Didn't work!!
Decided to buy a flatline barrel after the second game to see if it would help. Nope!!
I'm Sorry, but I just don't like this gun. Its pretty sorry when I could be happier with a used rental pro-carbine than a brand new marker. Needless to say I became like the rest and bought a used 98c off of eBay for $80 that seems to be better stock with the 8.5" barrel than the BT-4 with a remote and flatline or J&J.
I don't recommend this gun to anybody new or experienced. Do yourself a favor and buy a used 98, pro-lite or pro-carbine off eBay. Save yourself a $100 (not including upgrades) and get a tippmann, you'll be Glad you did.
If BT comes out with some good upgrades to the internals of this gun I might buy them in hopes of it helping with the C02 and speed but I'm not counting on it. And I've already tried to use 98c internals in this gun and they fit to tight and didn't help at all.
speed is how fast u can shoot. Velocity is how fast the ball leaves the barrel. Maybe u dont know how to adjust the gun. Its a gashog, so are tippmanns, and actually the BT's are more efficient then TPI markers.