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Penis foregrip and pistol grips are pretty unhinged. https://guncadindex.com/search?query=penis+&format=grid&sort=rank&time=alltime
great questions!
as the frame is designed to be FDM printed, the lasting nature of it will be solely determined by both your material of choice and the quality of your printer/slicer.
The 5.7 though, specifically, is HILARIOUSLY low recoil and required the least amount of mass to succeed (and still hasn't ever broke).
The DB Alloy will inherently take up more space as it has both a magwell and a pistol grip / trigger guard for the AR FCG it…
You could also print out a UBAR3 lower. It can take a standard buffer tube and it's held in place with a u-bolt so it's pretty strong. You can print it with or without an integrated pistol grip. The integrated grip is definitely stronger but not everyone will like it. https://guncadindex.com/detail/UBAR3-X:1
slip grip
pistol grips
bryco grips