MAT9KV2.1 minor update

Just some minor fixes in appearance... I still don't have a mat9k and this is still beta so you know let me know if anything is bad. If all is good and you want to print for more than fitment, make it thicker (more walls more infill) and I recommend gf nylon since it sits over the barrel and will likely melt PLA+. LBRY Tags: mat9k; spinn360; handguard; beta