I broke down and bought a 10 inch 9mm upper and still need the block, spring and buffer.  I like the idea of the haun block but do I need a $200 block or does the promag one work find with Colt mags?

The lower is a frankford arsenal w/ LMT sopmod and colt trigger group.  The upper came from armsunlimited and it looks like the bolt is ramped from thr factory, I do use KNS pins so that is already taken care of.

I would look for a hahn, RRA, Spikes, or check with Rudy, I think he was having a block made as well

KAK industries makes a nice block that drops in from the bottom and allows for last round bolt hold open. Only $100.