07-15-2018, 11:55 PM
You can. Absolutely can. You have your bases covered, and as long as the barrel quality is of the right level or above, you should be able to garner your desired accuracy thresholds with some left over margin. I'd say that going from 3/4 moa to 1/2 moa in a decent barrel would be your hand load development.
Build wisely, obtain the highest quality parts you can afford. Good call with the BCM upper, although any other good billet set would do well. For supreme accuracy, a thermal fit as you describe above or bedding the barrel/extension is recommended. You're putting it together anyway, why not? Bed the block if it seems even remotely beneficial. Same with the feed ramp polish. Any competent BCG will work, if you decide to go LMOS, just ensure that you follow the 5.56 guidelines for the same systems. 20 inch barrels do best with rifle length gas, though some are different and report good results as well.
Just make sure you get the basic fit right, and a high end barrel and bolt. You'll be happy.
My recommendations would be either Bartlein, Lilja, or Proof. All seem to be pricey, but report consistent results in the area of your expectations. Mark with Precision Firearms is a good source for either of the Bart or Lil, but will delay you as he's busy, and popular - for a reason. If waiting isn't a problem, then look hard his way.
https://www.precisionfirearms.com/48m8/6...rrels.html
The other option as I see it, is the LaRue Ultimate Upper kit in Grendel. You get what you're looking for, and much more for about that budget. And while (SOME) of our fellow board members seem to think LaRue's barrels are "off the shellf", they prove the falsity in that with their performance. Take a look at the LaRue UU kit before you make your decision.
https://www.larue.com/products/larue-ult...upper-kit/
Any way you choose to go, check in with questions. Someone here has done what you're doing at every step; and from my experience, you're likely to get good advice from competent do-ers vs keyboard warriors here.
You'll enjoy Grendel for your listed purposes. Welcome aboard, and keep us posted!
KS
Build wisely, obtain the highest quality parts you can afford. Good call with the BCM upper, although any other good billet set would do well. For supreme accuracy, a thermal fit as you describe above or bedding the barrel/extension is recommended. You're putting it together anyway, why not? Bed the block if it seems even remotely beneficial. Same with the feed ramp polish. Any competent BCG will work, if you decide to go LMOS, just ensure that you follow the 5.56 guidelines for the same systems. 20 inch barrels do best with rifle length gas, though some are different and report good results as well.
Just make sure you get the basic fit right, and a high end barrel and bolt. You'll be happy.
My recommendations would be either Bartlein, Lilja, or Proof. All seem to be pricey, but report consistent results in the area of your expectations. Mark with Precision Firearms is a good source for either of the Bart or Lil, but will delay you as he's busy, and popular - for a reason. If waiting isn't a problem, then look hard his way.
https://www.precisionfirearms.com/48m8/6...rrels.html
The other option as I see it, is the LaRue Ultimate Upper kit in Grendel. You get what you're looking for, and much more for about that budget. And while (SOME) of our fellow board members seem to think LaRue's barrels are "off the shellf", they prove the falsity in that with their performance. Take a look at the LaRue UU kit before you make your decision.
https://www.larue.com/products/larue-ult...upper-kit/
Any way you choose to go, check in with questions. Someone here has done what you're doing at every step; and from my experience, you're likely to get good advice from competent do-ers vs keyboard warriors here.
You'll enjoy Grendel for your listed purposes. Welcome aboard, and keep us posted!
KS
Nothing kills the incentive of men faster than a healthy sense of entitlement. Nothing kills entitlement faster than a healthy sense of achievement.