MPx-styled AR-15 Grip

Remixed from Spidematt's rad MPx-grip for AR-15 platforms:

--Bolstered thin portion in the high-rear near bolt-plate.
--Lengthened grip-base by a few mm for larger hands.
--Added a slight "finger-shelf" to the bottom-toe.
...everything else is Spidematt's hard work; send him your <3<3<3

Print in PLA+ @212c(60c bed), 0.15-0.2resolution with 40%-70% triangular infill. 4-6 outter-walls (incl.roof&floor) will make it nearly indestructible and pretty safe for live rounds.

Good luck!