Originally Posted by
GrumpyM4
The issue is the hammer riding on the bottom of the carrier and impacting the firing pin. A simple look at the top of your hammer showes the wear pattern of the firing pin rubbing where it should be. All wear on the hammer should be on the impact face, not any on the top of the hammer. ((improper wear pattern on hammer noted below)
I will bet that when you're "riding" your bolt home, you do not have the trigger pulled and held down. If you (make sure the rilfe is unloaded first) pull the trigger, then hold it down and then hand cycle the bolt, you'll find that this problem either doesn't exist or is greatly diminished.
This is because when the neutered bolt carriers came out, the intent was to prevent people from being able to put in an FA slector so that someone could allow their rifle to "slam fire" (for lack of a better term) their weapon by allowing the hammer to ride forward with the bolt carrier and impact the firing pin upon locking up (thus acting somewhat like a fixed firing pin weapon).
When the trigger is held back properly, the BCG moves freely, but if the hammer is allowed to ride forward, it impacts and catches on the firing pin, thusly slowing the bolt and the hammer (as well as causing undue stress on the firing pin and the firing pin retaining cotter pin) and doesn't allow enough forward inertia to allow the weapon to "slam fire".
Technically, there is nothing functionally wrong with your gun as it *should* work fine so long as you're actually shooting it.
On the other hand, the quality of parts in that thing is ****ing appaling..... :D