Yeah I have that lower. But, we are not working on that one yet... I snatched that up last year from a guy that got it and decided it was too much hassle... It is a off name? Tactical Machining? TM*? I have not even looked into yet. I found out that RRA is doing some BS with their uppers where they will only work with their lowers, I was kind of pissed and let it go... have you heard anything about that? (Oh yeah I was really leaning on the .50 but as much as I like too shoot it would be a little expensive)...