The XM8 was the military designation for a lightweight assault rifle system from the late 1990s to early 2000s. The rifle was designed by German small arms manufacturer Heckler & Koch (H&K), and shares design and engineering with their G36 rifle.
The reload animation is bit weird. It's just switch the magazine but after done it's suddenly switched back. Is there any other reload animation which you remove the empty magazine then use the new one instead?
Other than that, like the texture and model is fine enough.
Consider to split the UV to maintain the texture sharpness.