Recently built a varmint gun and took it to the range. Was disappointed with accuracy. Would hold about a 1.5" group at 100 yards. I could live with 1.5" groups, but every several rounds I have a flier in different directions about 2-3" out. Tried a variety of 55 grain factory .223 ammo, mostly PMC. The build is all new: Magpul stock and handgrip, DPMS .223 stainless fluted 20" bull barrel with crown, DPMS upper (lapped for barrel/torqued), Spikes Tactical lower, RRA two stage (polished) trigger, DPMS BCG, and a new, mid-grade Leupold scope (4X12) and rings (lapped/leveled/torqued). Ran about a dozen rounds, then cleaned it, repeated this 3 times, with cooling in between. Just plinking. Then got serious about accuracy. With fliers, holding 3" groups. I expected better accuracy. I currently have a standard, low-profile gas block with two set screws. Only one screw lines up with holes in barrel. Torqued both. Can't imagine this is stressing the barrel but I am not sure. Considering a clamp on, adjustable gas block. Have broken in a number of new ARs but never when I was seeking accuracy. Does it take a few hundred rounds in an AR before it settles down in terms of accuracy? Maybe I just need to plink with another 100 rounds or so and then go for group size. I will measure the chamber and hand load for it for my next trip to the range. Any opinions on the gas block? Any suggestions? Thanks.