[AgentTikki]

Unless you have that new fangled Colt, you can't use a 7.62x51 upper on a standard AR15 lower. The cartridges are too long.

[Olympus]

Originally Posted by AgentTikki

Unless you have that new fangled Colt, you can't use a 7.62x51 upper on a standard AR15 lower. The cartridges are too long.

I meant 7.62x39. I guess I didn't make that clear.

Now I'm also looking into the 6.8 SPC.

[tacticalfun]

Theres a whole beowulf lee kit on armslist for 50$