First of all I would not do any business with the guy that tried to scalp you for the $75.00That is absolutely ridiculous!
Secondly you can not mix match Mil-Spec and Commercial Stocks or Extension Tubes (Buffer Tubes)
You can tell by looking at the tubes on the collapsible stocks. The Mil Spec Tubes on the back end are at 90 Degrees while the Commercial Tube has a 5 Degree Angle on the end of the tube.
The Mil-Spec Tube is 1.146 in Diameter while the Commercial is 1.170 or 1.168 if you aske different manufacturers.
The Constitution is not an instrument for the Government to restrain the people. It is an instrument for the people to restrain the Government!
Today, we need a nation of Minutemen, citizens who are not only prepared to take arms, but citizens who regard the preservation of freedom as the basic purpose of their daily life and who are willing to consciously work and sacrifice for that freedom."
-- John F. Kennedy