Description
The Primary Weapons Systems MK216 is an AR upper receiver, 308, 16.1" barrel.
On an AR-pattern rifle the upper receiver is not the firearm – the lower is. That is why an upper ships directly to you while a lower has to go through a dealer.
A complete upper carries the barrel, gas system, handguard and usually the bolt carrier and charging handle; a stripped upper is the receiver alone. Check which this is, and check that the bolt matches the chambering – bolt and barrel are a matched pair.
Configuration decides the legal result. Putting an upper with a barrel under 16 inches onto a rifle lower makes a short-barreled rifle. Federal registration is no longer enforced as of 9 October 2026, but several states still restrict or prohibit short-barreled rifles, so check your own law before assembling one. On a pistol lower it does not. If you are unsure what your lower is registered as, ask us first.
This is a part or accessory, not a firearm, and ships directly to your address.
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