CP barrels. there cheap. you can get any bore. any length. one peice or two peice. they have any color to match. they have even a complete tactical line for the milsim junkies.
ive been shooting them on my G3 and on my ETEK 2 and they shoot great. as long as you use good paint the shoot amazing. ive shot triumph rec port and feild through it and i could tell the difference in accuracy. feild shot lasers out of it.
for $30 ts worth a try for a one piece barrel that you can get any bore and any thread pattern.