I have a GForce jawbone up for sale or trade has damage to frame I guess they are known to have this problem of cracking at the front takedown pin area still runs and shoots as it should..... open to offers/ trades.. you can cannibalize parts to build out a steel lower. I also have the pieces that broke off if you would like to try and fix it.... just seeing if anyone is interested... pick up in my local area only (OBO) trades and offers welcome -Six02.nine80.nine116