Nice mag tube BUT I have had it installed on my M4 less than a year and it is rusting. The gun is stored inside in a climate conrolled safe and has not ever been fired. Why is it rusting?????
I also attempted to install a Vang Comp standoff device and the threads on the mag tube are,evidently, not the same. It will not fit, however it fits easily on the stock mag tube.
Just pertinent info for those looking for a M4 mag tube.