Not a problem. Another 'perceived' issue ("I saw it on the Internet"), at least that is my personal opinion. We're running the sh!t out my M9Evo's. There's no better system on the planet.
To illustrate, this is the area of concern found on the rear of the bolt carrier:

and the bottom of the entrance into the buffer tube:

This is from my personal Colt/M9EvoM4 (the one in Special Weapons for M&P) that after thousands of rounds, shows no appreciable wear. In fact, after then examining my other Colts and Bushmasters, the wear pattern is virtually identical to these gastube guns.
I am the innovator (again!) while 'others' struggle to catch up, 'borrowing' from my brain.
Gen 2 will be the M9Evo' adjustable gas block (AGB)

and compression-mounting units.
Thx!
----------

Kurt@KKF
Member-The Fightin' 420/Sumter Div.

Last Edited on 26-Apr-2008 10:25 AM