Originally Posted by
C4IGrant
For testing purposes, I loaded up a PMAG with one round and installed the SF K Suppressor on the barrel. Fired one round. BCG locked back. SUCCESS! Wanting to see what I could get away with, I installed an H3 buffer. Loaded one round and got the bolt to lock back again! Cool I thought. Now let’s test this upper WITHOUT the suppressor on it (as I need the weapon to still cycle without the can on, but does not need to lock back). There is a VERY fine line here between the weapon extracting the round, picking up a new round, but not locking back.
With the suppressor off, I loaded one round into the mag and fired the weapon. No brass came out. Hmmm. I pulled back the CH and ejected the spent casing. I removed H3 buffer and installed an H2 and tried it again. No joy. Removed the H2 and went to an H buffer. Still no luck. Removed the H and installed a Car Buffer. Again, no luck. Now I am really wondering what is going on. The spring that is installed in the lower is a CS spring so I thought that was what was doing me in. I grabbed a standard SS carbine buffer spring and stayed with the Car buffer. Same result. The casing had to be manually removed. Grrrrrrr!!!
At the end of my rope with this configuration, I told Adam (board member that works in my shop part time) what was happening and he suggested that we install the LMT Enhanced Carrier that we used in my 10.5 upper. I said; “that won’t make any difference as it is actually going to remove more pressure and make it worse.” Boy was I wrong! This is where the story gets interesting and is the lesson on extractor dwell time.
I removed the Fail Zero BCG and installed the LMT Enhanced Carrier and Standard Bolt. I kept the SS buffer spring and Car Buffer. The suppressor is still off the weapon. I loaded one round and fired the weapon! VICTORY! The casing ejected from the weapon! With this success, I loaded up two rounds in the mag to see if the BCG would come back far enough to pick up and load the second round. Success again! Now I wanted to see how heavy a buffer I could get away with. I tried H, H2 and H3. All worked with the H3 pushing the envelope and only getting an ejection distance about two feet.
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