[QUOTE=chris dawe;194238 ...take your time with lots of breaks if its your first Allen.
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Chris is quite right. And perhaps not right enough. If you've never done chequering before, and this is your gun, I'd think twice about doing it at all. Frankly, the odds are about 10-to-1 that you will make a very bad mistake.
A pro like Chris can do the job perfectly. And probably within your budget.
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