I see in other threads where people quite often recommend the MkII and MkIII but don't see much about the MK1
The differences from Mk 1 to Mk2 make the Mk2 more attractive to me. Last shot bolt hold open, 10 rd magazine (vs. 9, not such a bit deal), and it's explicitly OK to dry fire.
Not that I'd refuse a good eal on a Mark I. No, not at all.
"As was the man of dust, so also are those who are of the dust, and as is the man of heaven, so also are those who are of heaven. Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven. "