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Colt Lower to build an mk12

MarineEngineer

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Hey guys I recently got me a Colt lower receiver and I'm looking to buy an upper for put together a MK12 like long range 5.56 rifle, but I have some doubts after all and I would like to know which would be a good lower to put together an MK12 clone. Of course I have to include a 2 stage trigger and everything. Thanks guys and be safe
 
Not trying to necro-post a months-old post but did you ever get this sorted?

Just throwing my 2c in: I have a PRI MK12 upper on a BCM lower and there is some VERY heavy wobble between the 2 receivers. I had to use an O-ring around the front takedown locking lug to tighten it up, until I got the rubber inserts a few people use - which continues to work great.

I got the same play between receivers when I put it on my LMT lower as well. So far its appearing like PRI (one of the original MK12 innovators) mate the best with their own lowers, based on my findings so far.
 

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