Nucleus – 6.5mm PRC – Prefit Barrel


The Nucleus/Mausingfield/Archimedes actions from American Rifle Company are extremely repeatable, so nice in fact, we are able to offer prefit barrels for their actions configured in a shouldered barrel. This means there is no barrel nut to worry about, with the use of a barrel vise you can spin off an old shot-out barrel and ours will thread directly back on and headspace correctly to your bolt.

Installation is seriously simple, just watch this.



Please note! This is a stock inventory barrel and they ship as-is.  No additional or custom work will be accepted at this time.
If you need something different, we are happy to take your order!  Custom, made-to-order barrels can be ordered here.

While we are responsible for making you a quality product, You are liable for how this product is ordered.  It is your responsibility to verify the head spacing and breech specs beforehand; we do not refund incorrectly, custom-ordered products.  Any changes to custom orders must be made within 48 hours of order placement.


Additional information


American Rifle Co – Nucleus/Mausingfield/Archimedes


6.5mm PRC

Twist Rate

5R 1:8", 5R 1:7.5"

Muzzle Threading

5/8"x24 + cap

You may also like…