Here is Yas' take on the VFC HK53 GBB Rifle in this review by Hyperdouraku... "I love the HK53. So I can't give an objective review. I like this shape anyway. The HK53, which is more compact than the HK33, is easy to handle and easy to handle. A submachine gun-like assault rifle that uses 5.56mm x 45 bullets, neither 7.62mm nor 9mm."
Read more here and below is the video made by Mister Moro: