I don't know what the concept of "alternate" DMR is. I'm Guessing 20in rifle with some capability to shoot accurately.
Build your own.
Bushmaster HBARs are generally 1/2MOA or under when free floated and fired by someone competent.
They aren't unfortunately availible with a 1/7 twist for the heavy 77grain rounds. The 1/9 will handle 50-68grain with accuracy, the 1/7's are government profile if they are chrome lined and these probably aren't as accurate. I'ld expect 1.2MOA from them.
The cheapest settup? a 20in HBAR with FF tube.
Better, a 20inch Hbar with FF RAS or rifle length SIR.
Best? the same fluted for reduced weight and inhanced accuracy.
The third option should cost:
$250 (barrel)
$350-$375 FF RAS
$85-100 upper
$130 B/BC/CH
$20 gas tube
$10 FH if applicable.
$860 for that upper, a good lower with match trigger from RRA is $300 or so.
[b]The match trigger makes shooting accurately easy.[/b]