I have this ASGI piston laying around and I'm wondering if it's still good to use, or worth just replacing with something else. Also, is it a 45 degree or 90 degree one? I'm a noob don't know how to tell. I'm going to buy a zero trigger soon for my TM VSR anyway, and most come with another piston if I'm not mistaken, so I may just end up scrapping this anyway. Thoughts?