I know this doesn’t answer your question but in regards to ammo, I’m shooting a Magnum Research and it hates anything over 1200fps. It won’t shoot CCI Mini mags. I think the spring is too weak and it’s cycling to fast. Federal ammo is just dirty. I’ve had good luck with CCI AR ammo. CCI has had ammo for weeks now in the mornings.
If I keep my mags clean, I might have one jam per match if at all(my Black Mamba jams more). My setup weights in at 3 1/4lbs. Briley barrel, Crazy Ivan chassis.