A forum member contacted us about some extraction issues with his Oly Arms and asked if we could take a look at it and maybe ream the chamber with a 556 NATO reamer.
So the we get the upper in and the barrel is marked 556. We attempt to stick our reamer in it, but cannot get the alignment ring on the reamer to fit into the upper receiver.Puzzled by this we gently forced the ring into the receiver and then twisted it. The Oly receiver started to remove material from the delrin ring.
Working our way into the receiver, we got the reamer into the barrel and started to turn it. The amount of material we got back from the this barrel was amazing! To date, we have never seen this amount of material come back.
So not only was the chamber out of spec, the receiver was too.
Moral of the story, DO NOT BUY OLY ARMS!
C4
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