adaptable machine carbine sketch WIP

the top is a prototype variant that was adopted due to its lightened structure and is far less common than the bottom, which is a slightly heavier version. These carbines are extremely compact and ideal for paratroopers and special forces teams in need of an adaptable gun that is easy to carry.

NOTES
-light rectangle at end of barrel is supppresor
-red dot scopes
-grips

please comment, constructive critcism is appreciated along with suggestions.

one question, do you like the black border or should i have a different color/no border?