Visited range early in the morning and fired 50 rounds in -20F environment. Planned to shoot 100 but I was almost frozen there so terminated the session early. In this session, I met the first malfunction. The 10th round (the 510th round if counted from the 'beginning') did not feed. It's the last round in the magazine, the bolt did not push the cartridge into the chamber and the round blocked the bolt almost fully open. Manully pulled back the bolt, released it, then, the round was chambered properly.
After 550 rounds, there are three visible changes on the gun.
(1) First, a tiny dimple has been built up behind the bolt stop on the receiver. See pix. Only discoloration is visible, but there is a tiny dimple which does not exist before round 1.
(2) Second, the bore is hard to be called mint anymore, now I can see scratches on the grooves. Only non-corrosive FMJ ammo has been used, no other erosion so far. See pix. Now, it can only be classified as excellent bore.
(3) Third, the ejected cases falled down the gun during firing so many times, a few minor scratches have been built around the ejection port area. The scratches did not cut through the blue, but visible, and not erasable via gun cleaning oil.
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