The 10-round Beowulf magazines are nice! Get them pinned to 5 3/4 Beowulf rounds so they'll actually seat on a closed bolt!
If it's either loud, obnoxious, fast, hated by the general population or any combination of these, I OWN IT!!
mags
gunpowder for breakfast and Trudeau for the circus
I'd buy an 50 Beowulf upper if I could also buy ammo for it.
If you can't fix it with a hammer, you have an electrical problem.
Complete upppers, parts for people making builds, mags and ammo would seem to be a fairly complete list.
Have Mech Will Travel.
Your TDR-5S Specialist
Serving you since 3024