thanks for the input; one of the concerns is with 922R compliance; I confess to not having a very good understanding of all the ins/outs of 922R, but as I understand it, the addition of an extended mag tube + pistol stock exceeds the allowable count - with a field stock & extended mag tube, one meets the compliance rules - again, I'm not even close to understanding the rule.
The other concern is to try to quality the quality of the install if the factory tube was installed after the fact. From what I see here, the install is not really for beginners to try.
Appreciate all the input I can get - thanks