imo the extcy is the best bang for your buck. I have a frew friends that own it, and they have nothing but good things to say about them. If you compare a rail and an extcy, the extcy comes out on top, an extcy is more equivalent to a reflex rail than a rail, in that case, a reflex rail is more expensive for no reason, extcy. (I own a rail btw)
Same thing happened to me when I got it, may be the noid, but I'll guarantee you almost 100% that it's the battery. If you have enough expertise, open your gun and check the noid to see if any of the tubes are blown out, or to see what's going on.
Also, Duracell. I bought a 10 or 12 or 16 pack or something at Costco that came out to being like $1.50 per battery. Don't use any of that cheap crap, it'll only give you bigger headaches, trust me lol.
Check ur regulator
Most likely not a reg problem, it doesn't fit in at all, it would leak elsewhere