Greetings. I recently purchased an M-400 at my local gun shop, I've put about 200rds through it in the last week, but the internals seem like they have a pretty rough finish, almost like unglazed porcelain. Is this common? Can it be fixed?
Fret not, help is surely on the way! There are numerous kind and wise folks here at Sig Talk, some of which will surely reply with the needed info or advice. In the meanwhile, you may want to take a look see at the Sig Sauer Rifle forum. Could be someone has already addressed this issue.
Welcome to Sig Talk! Don't have M400 and you didn't mention any problems running those 200rds. But to be responsive to your question - based on my Sig 516, Colt 6920 and PWS 7.62, the interior surfaces of the lower receivers are a buff-like finish.
However, the action parts, specifically the bolt carrier group,bolt and breach are the more typical hard-smooth finish. Sounds like M400's pretty typical...
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