These two SEI M-14s were the first two we made, assembled with USGI parts. They were test fired in an unheated condition, in the white, to see how much they could stand. We couldn’t believe what we saw – the receiver did not cave in after 50 shots each. The worst thing found was that the head space set back only .003 to .004, far less than we expected. The material used, a high grade 8620, was part of the reason it held so well. We cut them up after that test.
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