Circle Square Firearms sells firearms, ammunition, and related products. You must be at least 18 years of age to enter.
Some products and transactions may require additional verification and a higher minimum age (21 for handguns under federal law).
One Horse
Prices and availability subject to change without notice. Product availability subject to applicable federal, state, and local laws.
Run your rifle with confidence using this reliable M16 bolt carrier group. Built for 5.56/.223 and .300 Blackout it delivers smooth cycling consistent extraction and dependable performance in any setup. The full nitride finish adds durability corrosion resistance and easy maintenance all backed by Mil-Spec construction and a properly staked gas key.
A simple rugged upgrade for any AR15 build.
