Okay, as promised I got to the range today to sight in and test fire my new Adams Arms Piston AR. But since it hit 115 F today. I opted to wuss out and go to the nice air conditioned brand new indoor range. Sighting in was without issues, and even though I was generous with the trigger pulls I had it zero'd in at 25m inside of 10-12 rounds. I must say the ACOG Horseshoe reticle is nice.
The rifle, on the other hand, was not without problems. Almost from the beginning I had FTE issues. By the end of the first magazine, it was happening pretty consistently. I broke the rifle down and examined the bolt and extractor. One thing I forgot to mention in my build report was that I'd installed one of Brownell's improved extractor kits. The spring was supposed to be good for 50,000 rounds and was also supposed to improve extraction. This kit is shit. Everybody I know who's installed this kit has had the same issues regardless of DI or piston systems. As a product review for Brownell's extractor spring kit. Don't waste your 10 bucks. Oh, and the extractor pin supplied with the kit was a roll pin which is incorrect for that part. So, I broke out my tool kit, got out an extractor spring and pin from some DPMS spare parts kits, put those on the bolt and ran the next 90 rounds without an issue.
So, in summary, the rifle runs great, the piston is working as advertised, the ACOG is a dream, and I'm a happy camper.