Originally Posted By: steve garrettI checked out the aero handguards, They are reasonably priced. the problem I see with them is they require shims to time them. I don't like the idea of putting a shim or even multiple shims between the barrel extension and the face of the upper like that. every time the gun fires the barrel whips alot more violently than you think if you watch slow motion firing on video. I don't like the idea of adding shims in that particular area.
I should have been more clear, I ment the aero scope mounts being really light and well built.
But yeah there handguards seem decent enough, but i agree not a fan of shims if using the std upper receiver.