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9/1/2008 4:20:42 PM EDT
I just put my old AP4 back together now that I got a new lower to mate to the original upper.  I have probably mixed up the old 308 buffer and spring in the big pile o parts and cant seem to find one that works.   I cant pull the bolt far enough to lock open or pick up a new round.   I am guessing it's the buffer/spring combo.  

Is the 308 buffer shorter than the standard carbine buffer?

Is the spring shorter?  

All the buffers I am finding are the same ballpark length.   With my luck I put that buffer in a carbine I sold off...  
9/1/2008 5:12:22 PM EDT
[#1]
The 308 carbine buffer is shorter than an AR-15 buffer because the 308 bolt carrier is longer than the AR-15 bolt carrier. Go read the FAQ at the top of the AR-10 & AR-180 page.
9/1/2008 5:18:15 PM EDT
[#2]
Thanks, I didnt read the AR10 section as they're damned touchy about non armalite 308s.  

I figured that was the issue.  Since I cant find mine I went ahead and ordered one.  
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