Stripped or assembled?
DPMS for stripped lowers should be fine. Heck, for assembled lowers, they should be fine, too. Their small-parts quality is about average for the industry. If you end up using the gun hard, you may end up breaking/wearing-out some of the parts and springs in the lower, but that's not a huge issue (unless you use the gun for actual "work"). Heck, many people end up buying aftermarket triggers, and thus end up replacing many of the parts in question, anyway.
Mike