I've got a gen 1 in 243 Win that I picked up on a Christmas sale a few months ago. I found a couple bags of Winchester brass, some Berger 105 HVLDs and Hybrids and without much tuning it was instantly .4 -.6 MOA with Norma MRP with 105 HVLDs at 3020 fps. Now that the load is more refined, it's a solid .4 MOA or better 5 shot rifle past 300 yards. I've since installed a MI handguard, a Magpul PRS, and a titanium bolt shroud to spice it up a bit, but I'm still running the factory barrel with no problems.