I noticed this too. Maybe you take the low parts (magazine, handle) few quants up.
The M4 looks some what this (horray for American Standard of Information Interchange).
Code:
______________
/ ------------ \
-------------------- ------------- ---------- --
----_____________-- ---------- --- |
| |\____|\ \ -_ __ |
/ / \ \ ---- -
/___/ ----
yay I'm so sux0rs @ ASCII.. but hope this gives some idea..