A5 egrip flatline with opsgear folding pcs stock and adco tac sight
BT 4 Assault, Egrip, Scepter 'nade launcher, 32 degrees remote, pure energy 88ci 4500, empire reloader 2
BT E grip, lighter spring kit
Looks friggin' AWESOME, very well balanced, sturdy, easy to maintain, stock barrel's fairly accurate.
Air efficiency, have to disassemble the body to remove bolt.
I bought a BT-4 Assault about 6 months ago, and have loved every second of using it. BT paintball design has finally created the perfect gun chassis for all the Milsim Modders out there. This gun is very solidly built, and the internals are like a cross of an A5/98c. Very easy to gut and clean. This gun accepts A5 barrel threads, and you can also flatline it, since the barrel adapter's the same. Also an A5 model scepter launcher straps right on this baby out of the box in about 60 seconds without the instructions. The gun itself is covered in milspec picatinny rails, basically anywhere you can put one, making sight or scope mounting a matter of where, instead of how. The hopper sits into an elbow that slides on a weaver rail so you can quickly access the chamber, even during play, without taking off your hopper, not that I've chopped much paint in it anyway. I think this gun's chopped 4 stingers that were sitting in the sun all day since I've bought it. This gun is highly upgradable, and BT just recently released an E grip. The Egrip is very nice in itself, with a full alluminum body, and an alluminum double trigger that is super light and easy to walk. Modes include 13 bps ramping, semi, and 13 bps full auto. Not as fast as an A5 WAS, but I've found it works way better. Some modifications I recommend are first a BT spring kit. The stock spring is a real naildriver, and I had to crank the velocity screw way in. Also when I put the Egrip on, it would uncock itself occasionally when I was rippin' on it untill I changed the spring. This also reduced the recoil of the marker quite a bit. The barrel is pretty nice, the nicest stock barrel I've ever shot anyway. I still found it slightly lacking, so I replaced it with a 16" J&J ceramic, and the shroud slid right over the barrel, holding in place with 2 set screws. The ceramic barrel tightened up the accuracy quite a bit, and quieted the gun down alot too, due to the fluting. The stock barrel is only ported at the muzzle break, making it one loud mofo. The sight rail and fore sight are actually pretty accurate, but I suggest a flexible mask like a switch fs, or something rubber in the jaw area, so you can get your face in low enough to sight down it. The reloader 2 hopper feeds this marker flawlessly with the e grip, and I find the body style fits very nicely along side the rail system. Overall I say if you want a durable, reliable, affordable, upgradable, and easily maintainable milsim marker, this is your gun. At a retail of $279.00 out the box, you couldn't build anything else half this cool.
this gun rocks for woodsball players who want an easily upgradable M4 carbine style marker, without alot of dough or cheap plastic parts.