My Robert Burke tuned M11A1 just passed 35,000 rounds this weekend. We just trained and ran 2,750 rounds today without cleaning in a very sandy environment. In the past 2 weeks round count has been 7,150 documented logged rounds. Robert did a Carry Package, QTR and replaced a few parts with the "old new stock" German parts where he could like the Locking Block. Im also running a Bruce Gray Fat Black Guide rod as well as "Blue" .40 caliber OEM springs. Yes, "Blue" recoil springs in a 9mm. Reason is I run high round counts with NATO spec SAAMI pressures. Robert said to try the "Blue" springs and change out every "10,000" rounds vs the "white 5,000" He's right, flawless functioning. I highly suggest Robert's work. Robert is an amazing person to have work on your firearms. I trust my life everyday to Robert Burke's work. I realize there's good armorers out there, however, no one works on my firearms but Robert Burke. Thats the trust I have in him.