03-16-2012, 04:20 PM
Guys, read his symptoms and then ask if this is a recoil system issue, or a worn out upper charge handle latch recess issue. The charge handle pops out on the initial recoil impulse when the bolt is still locked on the guns I've seen it do it on, so it wouldn't matter if you had every buffer known to man. It usually happens on 6061 uppers with a sub-standard anodizing.
The anodizing acts as a case-hardening of sorts for the aluminum. 7075 is the way to go for a harder upper, as is a Mil-spec Type III hard-coat anodized finish, which penetrates deeper into the aluminum. I've never seen a military M16 or M4 with this problem, but have seen it on a few civvy guns, and the actions get worked a lot on military guns.
The anodizing acts as a case-hardening of sorts for the aluminum. 7075 is the way to go for a harder upper, as is a Mil-spec Type III hard-coat anodized finish, which penetrates deeper into the aluminum. I've never seen a military M16 or M4 with this problem, but have seen it on a few civvy guns, and the actions get worked a lot on military guns.