Originally Posted by
BTL BRN
I am slowly and cautiously building an AR10 myself, the only components I have so far are an AP M5 lower and their LPK; already there have been a few "interesting" discoveries.
1) The pivot pin detent and spring (mostly the spring) seem to be the same as what is found on a typical AR build but this makes them quite a bit too long to fit into the M5 lower. The pivot pin is installed through one of the "ears" on the receiver, not along the dust cover like on a M4 receiver. Carefully measuring as I went I ended up taking off probably around 5-6 coils to make the spring work.
2) The magazine release button, spring and lever all appear to be standard as well; the problem being that the AR10 receiver is notably thicker. The button does not thread nearly as deep as on an M4; I am not sure if I was sent the wrong release, or if they are all like this.
Thanks for starting a thread like this, I am sure it will be required reading for me.