But no pins.
proprietary takedown pins came with mine when i ordered from DSG. Thats where I got my mkII lower from. They included the installation instruction sheet with it too.
http://www.cavalryarms.com/MKIIinstructions.html
Notes to Gunsmiths and Armorers:
- Takedown Pins: Use the supplied speed pins to secure your upper receiver to your CAV-15 lower receiver. If you lose or misplace the supplied pins, replacement pins can be ordered from Cavalry Arms at a cost of $5.00 a piece.
Frankly I can’t see the attraction. For less money you can get an aluminium lower that you can configure as you see fit, not saddled with a mediocre rubber pistol grip and solid buttstock.
I built this 16" carbine that weighs a scant 5 lb 1 oz (without magazine). Although I have not ran it hard, it has been flawless in operation so far and it handles great.
I highly recommend Cav Arms lowers and wish I had the cash to buy another one. Get them while they last!
Is that 5.1lbs with the light?
What upper is that?
One of the best lightweight builds Ive seen.
Can you comment on how long that stock is compared to the adjustable ones and at roughly what setting its equivalent to?
Thanks!
Yes, the light and mount are very lightweight.
The Upper is a Bushmaster Carbon-15 (plastic). Carbon-15’s get a bad rap but from my limited experience (this is the only one I’ve had), they assemble and run just fine (it does not have a forward assist or ejection port cover).
The stock built in to the Cav Arms Lower is A1 length and is just right IMO. It’s roughly the length of a collapsible stock fully extended.
I like them:
I like the Aluminum version!! 
Thanks bro.