I have been considering an AR-10 build myself! I would buy the pieces here and there and see what happens. As far as caliber go, I was looking at the 6.5 Grendel, however, I think the .308 would be a better choice as far as ammo availability! That and I don't own a .308. I was on krieger barrels website and if you send them your upper receiver and bolt group, you can have them install one of there barrels. I guess my intent with this rifle would be a Long Range AR. Would look at either a 24-26" barrel!
"AR-10/DPMS-LR Chambering Services:
We can chamber and headspace an AR10/DPMS-LR style barrel however you must supply us with the bolt so we can properly perform this work. If you are sending a bolt for this purpose we ask that you send the BOLT ONLY (no carrier) and that the bolt be stripped of it's ejector and extractor. This is needed as we spend far too much time dissasembling and re-assembling customers parts. Also, many of the chromed bolts have extremely tight fitting pins causing additional work on our part. The bolts supplied by the customer are YOUR responsibility and we can no longer continue to spend hours every month working on these components.
If you send your bolt assembled and/or with the carrier an additional charge will be added for dissasembly/re-assembly.
If we are performing a complete fitting on your upper, then send your assembled components as always.
Thank you, Krieger Barrels, Inc."
M1Garand & M1A/M14
I would consider doing this, seems pretty easy and you get a quality barrel!