I need a new 308 for spring and since you guys are the ones who shoot these, you're probably the best ones to ask. I am thinking either the Armalite, HK or Sig. Which one could I expect the best accuracy from?
Thanks!
Of the ones you chose. The Armalite will likely give you the best accuracy. The other two are piston system designs. Very good rifles but ultimate accuracy potential is better from a DI rifle if all other parts are equal.
There is however one thing. My Armalite rifles all have the Walther Lothar 1:11.25 twist SS ceramic coated triple lapped barrels. They don't have the 1:10 twist commercial or target barrels that usually come with their various models. The 1:10 twist will shoot very well but you will have to go outside of the usual Federal gold 168-175 rounds that the military twisted barrels seem to love. The SASS version does come with the Walther lothar or current equivalent but it's in 1:10 twist. Mine has that barre in 1:11.25.
I have a buddy who is a die hard HK fan. He has the MR308 and swears by it. He can shoot. I've seen his groups with his Hk and they are decent. That being said his groups from his Armalite AR10T DND rifle smoked the HK. I personally don't really like the HK that much. I want to like it because it's HK. I like the looks of the newest handguard as well, although it puts the bipod much further back than I would want for an accuracy rifle. But ultimately for me it wasn't the end all be all as many think it is. Some really drink the HK cool aid. So for them the rifle is everything they ever wanted. For me, I hated the pistol grip, I found the forend sort of awkward and it balanced very poorly. My AR10 DND rifles are also front heavy and big but they really don't feel as awkward as the HK did. Also even the LMT MWS which is heavy due to the monlithic upper and quick barrel change feature didn't feel as bulky/awkward to me as the HK. Maybe with the newest coolest looking handguard some of that is mitigated. That being said I was a bit underwhelmed with the one I handled. That same buddy also has the 223 version. I liked that one better than the 308 version. If you really want HK and can get a smoking deal on one then it is a consideration. But I would look one over in person first.
The newest A version of the Armalite rifles take pmags as well so the mag concern isn't an issue anymore. The main considerations with these rifles for the best accuracy is DI (so you don't get any harmonics etc from a piston system), the barrel and the trigger.
Les Bauer also makes an accuracy AR308 rifle that should be considered. Along with Larue OBR rifles, KAC/LMT, etc etc.
Price/use are important. A guy with a $1500 DPMS Gen1 could very well out shoot or shoot with someone sporting a $6100 KAC SR25. Accuracy with combat DM type rifles is exceptional these days. That being said, an AR308 with a full match bull barrel and trigger could very well shoot better. It's sort of like comparing a tactical precision rifle to an F class rig.
There is no definitive answer to this question. Everything involves compromises. Price, performance, function, features.
I do like everything about the KAC SR25, except the price. I currently have a KAC SR25 ECR 20" that I look forward to shooting in the spring. Upon first inspection though, my LMT MWS with 20" SS barrel is about 90 percent KAC SR25 for what was at the time half the price but is now about 2/3rd the price.
If you're looking at a carbine ie 16" then the DPMS GII Recon is the current one I would go with.