I recently bought a (NIB) BVM 1/6 F-16 and it had exactly this problem.

The outer pipe was welded at both ends and on the first ground run the outer pipe was pulled out from one end and wrinkled.

The pipe was utter crap. Not what you'd expect from BMV.

I got Joey (JET Pipes) to strip off the outer pipe and make it properly with a sliding fit at one end.


Paul