Don't try this at home.

Surefire Hi-cap mag (x5) and a slightly modded M4 (heavy barrel and non-standard gas tube.)


A regular gas tube would melt into a pile of molten goop after that.

Surefire has done some mods to the design to hopefully get better reliability in more ARs (they were originally designed around Colt M4s.)  Unfortunatly this means the release date is pushed back to the end of June.

(h/t Gear Scout)