Must haves:
Geissle Super scar trigger
GG&G canted charging handle
Magpul scar safety selector
Magpul grip of ergo (I have ergo)
Scars have a 1:7 twist. So 62 gr preferably 77gr. 55gr isn’t as accurate (at least in mine)
Clean the piston out every 1,000 rds or so.
Shoot the hell out of it. I have 5,000 through mine and love it. Such an awesome and versatile weapon platform.
I have the factory 10” and obviously the 16” barrel it comes with. Have shot most rounds suppressed throughout an OSS can. Best suppressor host I own for 5.56.
Easy to swap barrels and minimal re-zeroing when changing barrels.
I love being able to put my 10” barrel on, through an Eotech and have it as a SBR, then taking my 16” barrel throwing it on quick and putting an LVPO to have a DMR type set up.
I personally believe if the scar didn’t cost so much it’d be much more widely used than it is now.