Nothing really outstanding, but I'll post it just because that BCM grip took me a lot of time to install.
Well, install... not really. Simply because it's a grip pour RIS interface, and the early Geissele handguards (SMR MK4 MOD1) are not made to fit any additional accessories. Therefore all the keymod/MLOK things do not fit, and if you want them to you'll have to go through some DIY handywork.
So... yeah. Had to drill the grip a bit, and "craft" a "saddle". No, no pictures of the "saddle", i'm not touching that thing again!