So there’s a bolt in front of the magwell that runs up into the upper. You need a 3/16” Allen key to loosen it off. There’s a much smaller Allen bolt that is used to capture the takedown bolt in place, do not remove that. Once the bolt is loose and dropped down the upper slides to the front about an inch or so then you can lift it off the lower. Like I said mine needed a little love tap to get it moving the first time.
thats the size. ill amend mine. i knew it as 5/16 or 3/16
once you get it apart. oil the rails. definitely helps.
also side note, once built, you dont slide it back together from the end, you place the upper half way roughly then slide it together. the hammer prevents it sliding all the way from the start once built.
Anybody else find that a standard ejection port cover hinge pin isn't long enough?
Just received mine.... Can't figure what caliber it is... At the very beginning, we had to choose which upper we want... Is upper now multicaliber ?