The M4A1 styled rifle should have the ability to use the bolt release mechanism that many other games like contractors and Pavlov shock have, it would be easier to reload and many other things, the weapons in the game that have this feature irl are
M4A1, Scarrus, Vector, having these weapons being able to use their bolt catch and release buttons would make the game much more fun and reasonably realistic with a new ease of reloading these certain weapons