Are the shims not hardened? Anyone? Bueller? If so the stock (it'd be round stock btw) couldn't be run of the mill (pardon the pun) and the shims would have to be ground. Not as easy as it first appears.
How are you sure this buddy of yours is so good? Since by your own admission you don't possess the skills to make a valid determination it's easy to be fooled. Happens all the time to people. Free is no bargain if he mucks it up, and if he doesn't know 7Ms there's a chance he will.
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