The M4's bolt texture is placed too far forward Photo reference for correction: http://www.mikedudleyweapons.com/s/cc_images/cache_941401335.jpg?t=1419278398 the notch of the bolt is supposed to line up with the bolt dust cover's bump.
The Mosins back end c disk shaped part of the bolt is too far down and clips the body of the gun Photo for reference and correction: https://lmgfirearms.files.wordpress.com/2014/10/dsc_0135.jpg