I need to know if I need a mil spec or a commercial. Which one fits the tube for the m&p 15-22? I was looking at the magpul ace airsoft stock.

The buffer tube is Mil-Spec.

When I went to the local airsoft shop, the real PTS ACS stock was only $5 less than the regular one. Magpul just released a lite version that is about $95. It doesn't have the storage tubes, but still has the sloped top for a better cheek weld. If you pay less, you are getting a counterfeit.

I wouldn't pay more than $50 for an ACS PTS stock. I've seen a few for sale at that price on fleabay and on forums.

I got the real one with Mil-Spec tube from US CAV right after Xmas for like $94 shipped. Of course I found a good discount code online to get it for that price from them.

Real Magpul PTS stuff is almost a expensive as the regular Magpul stuff. Like I said, if you get a brand new ACS for $50 off Ebay, it is a counterfeit. If you're fine with that, so be it.