Think this goes here. My buffer tube is milspec, I haven't calipered it myself but website specs claim it at 1.14". And I bought a milspec stock.

It seems as though the stop pin doesn't protrude high enough to catch the holes in the buffer tube. Side by side the magpul stock pin is considerably lower than my stock stock. When I depress the latch on the magpul the stop pin does not go flush with the stock but goes below.

What did I do wrong?

Pics below. Magpul on right. Sorry for crap pics. TYIA!