I Think aswell,that you should take a step back, abandon this one for a while , and do the whole Milenia's gun tutorial on ytb, learn the fundamentals of the whole proccess.(or restart this gun and do it while you watch the tutorial, which was linked by someone a few posts earlier)
Looks good so far man. I think your topology needs some work in the pump part (not sure whats that called exactly), and some of your support loops seem sorta oddly placed imo. Like the back of the gun (large wooden part) seems sorta blocky, like its not transitioning quite right. and I think the furthest part back (the…