The KP-15 is a monolithic polymer AR15 style receiver made from injection molded 30% glass filled nylon incorporating the buttstock, buffer tube, pistol grip, and trigger guard  into the receiver design as integral components.  

This manufacturing process offers several advantages

Lighter weight compared to similarly configured receivers
Lower cost to similarly configured receivers
Increased production speed and elimination of sub components through integration; especially important during high demand cycles in the market.
Features Include:

Compatibility with most common AR15 uppers and lower parts kits
Flared magwell to make reloads under stress easier to perform.
A1 Length 13” Length of Pull (LOP) Buttstock to fit a wide range of shooters
MLOK Slots at rear of stock for sling attachement points or run a strap through it for simple sling attachment
Holes at the front of the stock for QD socket inserts for more sling attachment options
Improved grip for comfortable use
“Winter” Trigger Guard
Stripped Lowers Include:

Pivot and Take Down Pins
KP-15 Selector Detent
Buttplate
5/64" Roll Pin to Retain Buffer Detent