Pros:

Looks great.
Has very good detail.
Its Magpul!

Cons:

The only thing from Magpul is the hand guard.
Has no M4 flip up sights.
doesn't have a Magpul buttstock.
Most importantly has no P-Mag M3 ETC...

Conclusion:

Great looking gun. My gun of choice for the m16 slot. But, it wouldn't be a real Magpul M4 without the Magpul Flip up sights, Buttstock or P-Mag M3 etc..