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4/30/2005 2:05:01 PM EDT
I have an M16A1 upper slabside as it is called. I have a RRA lower going under it when it comes in on Tuesday. I am assuming I will have to buy a shim for the rear pin of the lower. I just found out about the small pin large pin stuff.
4/30/2005 2:11:22 PM EDT
[#1]
A slabside is not an A1 is it just an M16 upper.  If it's an M16 upper and not a Colt SP1 upper it should have small pin holes and won't need an adapter.  Are the holes in both lugs the same size?    
4/30/2005 2:13:48 PM EDT
[#2]
Just checked the pic from the auction it was from and it is a large hole.
4/30/2005 2:27:01 PM EDT
[#3]

Quoted:
Just checked the pic from the auction it was from and it is a large hole.



Bushmaster has what you need.
4/30/2005 2:34:32 PM EDT
[#4]
I checked theirs and the bushing would be $10 shipped so it is cheaper. Anyone like one over the other?
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