I had a 24" LR308 that worked great both suppressed and un suppressed. I had to put an adjustable gas block on it to work with the can. Too much back pressure otherwise. Would hold 5/8" 5 shot groups with my reloads. Factory mags functioned fine as well. You'll want to get a different trigger and I would recommend a Geissele. They are pricey but, worth EVERY penny!
I load just a "tad" hot and without the adjustable block, it would nearly rip the rim right off of the cases. I ran the block 3/4 turn open from fully closed and the issue went away. Perfectly reliable. Take the can off and open it another 1/2 turn and rock on!
I own a DPMS LR308, and it's been a tack driver out of the box. I feed it Lake City Match 168gr BTHP's, and my own formulation LC match brass, 168gr Sierra BTHP, using Varget powder. The picture shows it with a Nikon Monarch. It will shoot 1/2 MOA at 200yards.