I bought a CSR-1516 when I first got into 3-gun and it was a great rifle but I got the itch to make a few changes. Hopefully it goes well, I should be able to test it out soon.
-CSR upper receiver
-VDI low mass BCG
-Faxon pencil barrel
-SLR adjustable gas block
-JM brake
-PRI charging handle
I am going to reuse the CSR tube handguard because I am cheap and handguards are expensive. I am going to take some material off it to try to lighten it up a little more. Can't wait to try the adjustable gas system with the (relatively) low-mass BCG. I hear tell when tuned they kick like a 22.