Hey everyone, I'm fairly new to the ar scene and a brand new member here, so apologies in advance of this is posted in the wrong area of the site. Now, I have built an AR-15 from the ground up starting with an 80% lower, I've also built a glock 17 starting with an 80% both were purchased through polymer80. Now I've completed both of the platform that they offer, I'm curious if anyone knows of any non AR or glock platforms that can be built from an 80% lower? I'm already planning on doing an AR-10 next but I'd love to keep doing this and expand my collection. Thanks in advance guys!