It's a slightly worrying sign if he starts putting things like weaver rails and things on there, making it look too much like "modern day weapon porn". I'm fine with USCM weapon tech having evolved during the 30 years between the films but I don't want my Alien mixing with Black Hawk Down or The Expendables. Also, if the USCMs in this movie go "hua" and/or hold their PRs in that correctly-safe-yet-ridiculous-looking angle with the crooked wrist, then I'll personally fly down to South Africa and hit Mr Blomkamp in the head with a mallet.
I'm just sayin'...