Orthodoxy001: I too have had similar accuracy results. And yes, of course the lower makes a significant contribution to the accuracy of the rifle. To state otherwise shows lack of first hand experience and common knowledge shared by all AR-15 / M-16 armorers. If it all boiled down to a barreled action and receiver only, why would rifle makers bother with pillar bedding, aluminum bedding blocks, glass bedding, etc. on precision rifles?
Below is an image of the first 15 shots through my rifle. They were fired during break-in using 3 different bullets in front of the same charge of 26 gr. of H335. The groups are so-so for a custom rifle, but considering all of the gymnastics required to disassemble, swab the barrel, and reassemble with each shot, the groups aren't that bad either. Since then, I have shot many of the itsy bitsy cloverleaf groups that Orthodoxy001 speaks of. (Not using the junk Winchester FMJ stuff, or course)
And to you, Mr. Patterson: I normally don't respond to such jabs, but your quote stating, "All the praise for these lowers are from guys with very low post counts. Always worth taking into consideration.." really rubbed me the wrong way.
Is the number of posts one makes the basis of validity here on The High Road? If so, I am unfortunately spending my time and sharing my real-world experiences in the wrong place. I do not feel the necessity to post nonsense for the sole purpose of rasing my "post counts". I do notice, however, that the overall tone of THR is more argumentative and counter productive than other forums. You, sir, are contributing to that impression.